Dear Vriska, or Dear Past Me, if you need something off of the list.
I've done Vriska several times, so I'll do past me.
Study harder for calc 2, especially early in the year. I kind of wish that you'd read homestuck when you google it when you were 17 cause you might have met Crow sooner, but I'm glad you chose to read it at all. I wish that you hadn't been a piece of shit teaboo and thought that you "weren't like other girls" cause you watched doctor who and could program. I wish that you'd watched more anime instead, or played pokemon earlier.
But, all in all. I don't have that many regrets. Sure, I regret small things, like falling off the wagon so many times on exercising or licking some doorknob on a dare and getting mono, but I'm overall very happy with the person I am today. I did a lot of growing up when I got to college and I'm glad about that, but I still don't regret anything.