Stand back, people, I've experienced this sort of thing first-hand before.
This exact same problem befell me in 1999. First of all, I suggest you dig deep down and try to isolate why you like "Pokémon" so much. Is it because you're trying to be popular? Are you trying to shun something unpopular that you liked before by replacing it with this? If so, then I encourage you to stop immediately. This is what happened to me, and I took it too far. What needs to happen is, you have to get out and experience new things. Try looking around for television shows you think you'd like. Read a book. But above all, leave your obsession behind. Lock up all your Pokémon memorabilia, or sell it if you have to, just get away from it. If it's not there, it can't hurt you. Once you feel that you've shed your obsession, you can ease yourself back into being more social. Talk to people, and ask them what they like. Show interest in what they have to say, and you may find things that you can replace "Pokémon" with in your life.
I know how hard it is to like "Pokémon". I know the pain and suffering of being teased, taunted, and shunned because you've gone off the deep end. But you recognize your problem, and that's good. It took me a good three years to undo my obsession because nobody tried to help me. I remained blissfully ignorant until I hit puberty and realized that no girl wanted to go out with a guy who thought "Pokémon" was the coolest show on television. Be strong, friend. With my advice and a whole lot of effort, you can give up "Pokémon".
(No, I'm not taking this too seriously. "Pokémon" is a social killer. Believe me, almost NOBODY likes it anymore.)