Hey, uh, I'm a guy, and I don't know how else to explain this, but my girlfriend brought home this new drink. She said it was really good, I tried it, and now my hair is changing and I think I have tits now?
Ugh, I'm sorry, dude! I guess you haven't heard. Sounds to me like your girlfriend is trying to make you into a Boy-byMaxxer. If you search for it, you'll find it. Went viral a few weeks ago. Girls are, "as a prank", giving their boyfriends huge boobs and making them more feminine to see how long they can hold out against the new urges and personality that starts to form around their new figure. That's why your hair is growing super fast, has gotten way silkier, and, well, why you've got a pair of big, juicy tits growing on your chest. Now, she's gotten the upper hand by surprising you with it, but you can take back control. You can resist. You can beat her at this little game. You just need to focus on a few key things.
The first is accepting what's happening. Your boobs are going to keep growing. There's nothing you can do about that. I'm looking at some examples, the average boy grows until his tits reach his bellybutton, but that is an average. Some smaller. Some bigger. Some much bigger. She gave it to you, you drank it, now you just have to wait for the changes to finish. There might be some other, minor changes, a slight shifting of body weight to the hips, a subtle change to your facial structure, but the biggest changes are going to be your hair and your tits. The sooner you can accept that this is happening and understand why, the sooner you can start mounting a proper defense.
As you get bigger, your girlfriend is going to want to get you fitted for a bra.
Do not do this; this is a trap!
It starts you on a very slippery slope of "picking clothes that are better suited to your new body." Pretty soon, she's going to be insisting that you wear shirts with deeper necklines, tops that are fitted to your huge, growing tits. And, of course, those clothes are much more feminine, raising the temperature of the water around you towards a dangerous boil. Your biggest weapon against this is to state, simply and clearly, "I am a boy. Boys don't wear bras." Say it as many times as you need to, as many times as it takes. There may be times when you want to wear a bra and that's okay! Those feelings are natural! They're going to be heavy and full and sloshing and jiggling, with your nipples constantly poking against your shirt. But the principled stand is more than worth it.
The harder you cling to your old routines and old hobbies, the easier it will be to keep from slipping into new habits. If you like sports, go all out. Absolutely insist on going over to your bud's place to watch the game. Most jerseys are already oversized, so you should have no problem still wearing yours, even if it fits a little differently. Football is a great way to reconnect with your masculinity! And, while you're watching the game, try your best not to think about how built the players are, how strong their hands are, how good it would feel to have them squeeze and grope and slide their thick cocks between your your massive, swollen, sensitive tits. Just focus on the game. Your friends will help you! They don't want to lose their bud. After a few beers, one of them might insist that you all take your shirts off. Don't hesitate. It's a male bonding experience. After all, guys go topless around each other all the time. Having gigantic tits and long, flowing hair doesn't change that.
Anyway, all that is to say that you can beat this. You can tough it out. You just have to stay strong. I'm rooting for you!