Memory comes and goes depending on the situation and your environment. I am sure you will be just as capable as you once were, just give it time and do not force yourself into a frenzy when you encounter a creative block. If your interests do change, I suggest that you remember the people who you have met here, and stay for the friendships you make above all else. The fandom might leave your interest, but once again, time gives rise to changes. This is absolute. Finally, you say that everyone else seems to be smarter than you. The only reasons that this seems to be the case is because everyone only talks about what they know best. Ask me about firearms and gaming, I will tell you everything. Ask me about agriculture or culinary arts, and I would seem like an idiot. Trust me, you are an intelligent person. The feeling of occasional inadequacy is common for a lot of people.
1: When college starts, I will be alone at my dad's house as I attend community college due to monetary issues. Crappy internet, nobody around. Alone.
2: I constantly feel like I am not worthy of the people around me. I also feel like anybody I talk to is offended by something I say, and maybe my bluntness might be the reason for that.
3: I fear that my life will be a failure.