Someone who mocks you for your interests is not a friend. Yeah, sometimes friends tease each other, I'll give you that, but this sounds like she is downright putting you down. This is wrong. You should not feel uncomfortable talking about your interests. Healthy relationships flow naturally, where both people contribute and both people get something out of it. It sounds like this friendship is very one-sided. You can try and talk to her about your feelings if you want, but honestly if it were me I'd let her go, and find friends who do care about you and the things you are passionate about. I promise if you find friends who really care you'll notice it feels a lot better emotionally than trying to hang on to someone who doesn't really care about you.