Please cherish those true friendships and clear your mind. I used to be as lonely and helpless as that friend of yours, but I have always been under those pressures alone. I have never had a completely trustworthy confidant and few good friends. I realize the important influence of friends on a person's growth.
I hope you will weigh your friendship comprehensively and make a wise choice. There's nothing to worry about in these things. That's how you grow up. In addition, I hope you put your study first and don't let other things hinder your progress.