It is very healthy to experiment with different things in your teen years. You have to explore the things that interest you. It's like trial and error, You need to explore your interests and eventually you'll find something that really sticks. I'm 17 years old, and I have experimented with lots of different hobbies and interests and have realized that they aren't a fit for me. Some stuck, but most of them never did. So just try everything out and see, because you'll never know until you just try! Horses found their way into my life and it has really stuck and made a big impact on me, and I hope they'll stay in my life forever because I've never found anything I've loved more than horses.
As for the teasing...I feel your pain. I don't get teased a ton but it happens. And don't let it bother you like LadyDreamer said. I ignore it completely and even laugh at it. I walk down the hallways in my school and once every day someone yells YEEEEHAAAAW at me or talks in a hick accent to me. It's annoying, but I've learned to embrace it and almost take it as a compliment now. All they're doing is pointing out to me that I'm a individual and whats wrong with being an individual?
Anyway, just ignore it.
And don't just quit riding all together, just ride less often. I can see how riding everyday doing the same routine would get kinda boring. Like they say, everything is better in moderation. I do arena work everyday and rarely get to go out on any trails or anything. Arena work does get a little boring after a while, but I never hate it. Well, with the crazy horses I work with everyday is something different haha. You're pretty forunate with what you have, and you need to realize that. I would kill to have everything you have and do what you do.