If you're really young (teens through 20's) and trying to get into activism, I want to go ahead and inoculate you against the disappointment you'll probably encounter at some point when you're trying to work exclusively with other young people on a project. There's this stereotype that it's the young people who will change the world and that it's like a right of passage to get into activism while you're young, but it's also REALLY HARD to start an organization or to have people consistently commit to a project when everyone on the team is in their teens through 20's, and that's not because young people are undedicated or flaky; it's because young people's lives are so prone to change and chaos. People in this age range are physically moving a lot, finding out they have mental/physical health issues, changing jobs/career paths, having kids, getting married, going back to school, leaving school, etc, in a way that people with fully established homes and lives don't. That's why so many boards of volunteers and non-profits are filled with the 60+ crowd. They're stable. They're not moving. They're not having any more kids. They have disposable income and free time if they're retirees. Don't get your hopes crushed if your 20-something friends SWEAR they will commit to some project with you only to be like "oh sorry, my courseload is too heavy" a month later. It gets really frustrating, and it can be easy to blame them for "not being dedicated enough" to the idea to pursue it through life changes, but that's what happens very frequently when young people get together to form an independent project. That's not to say it's impossible - of course there's all kinds of start-ups and programs started by young people that end up in the news and on TV, but I want you to know those successes are possible but not the common experience, and the media makes it look a lot easier than it is; you need more than pure enthusiasm to carry the team.
Ex: I ran an art contest in my college's science department to encourage people within science to also create and experience art. I had THREE other people signed on to help me with this, one grad student and two other college students who were in another club with me. Throughout the whole project, they did not answer one of my emails. When I physically found them in person and asked them to do stuff, they'd promise they would then get overwhelmed with coursework and not do it. And for context here, I was asking them to do stuff like open their emails and vote on the images of art pieces I had sent to them. Stuff that didn't require any physical effort and would take under 10 minutes. When I eventually got really frustrated with this and confronted them about it, two told me they just got really overwhelmed with school, and one was like "oh sorry, I've been having medical issues."
I would say that if you're a young person encountering an extenuating circumstance like that, please please please communicate it to the people you're working on projects with. Like honestly I still haven't completely forgiven them for leaving me to do the whole thing by myself because they didn't even update me so that I would know I could no longer plan on having their help. But that is what my common experience has been working with younger people on projects - they get overwhelmed with the changes in their lives, and they don't communicate that to you. The latter is something for those people to work on because there's not really a good excuse for that unless you physically have no means of communicating to others, but the former is something you should just expect: young people who say they are dedicated to a project and are ready to see it through really mean that... but will often find out that they can't keep that promise because they just couldn't conceptualize the toll that a life change would really take on them (partially because every change is usually a new experience - first moves, first semesters, first jobs).
Another example: A friend of my mine in college volunteered to be on a team of people (also college students) working on identifying the lowest-income schools in the area and trying to get them more resources. Said friend wasn't even the leader of the project, and he's the only one who did any work on it past June. The entire thing fizzled out because the project's creator who you'd think would have the greatest dedication to the idea got overwhelmed and dropped it.
And I say all this from my experience as a young person working with other young people. I'm not prejudiced against young people at all and fully believe in the ideas and capabilites of the younger generations. I just want to warn you that while there is immense value in working in groups, you might get more done as a young activist working exclusively on projects that you can carry out by yourself or by joining community groups that have a diverse range of ages involved so that there are people with more stables lives around that can carry the cause when others are going through some form of life turmoil.
In any case, don't let the difficulty of carrying out group projects or working with others discourage you from doing things or give you the impression that that's always how it will be. You will eventually find the right people to work with you, but that might not happen consistently until you and your group members are at an age where you're more insulated from personal change.
