How to hide anxiety?

I know this is strange, but I have anxiety, have for almost all my life (I'm 15) and I feel like it bothers others. Most of my anxiety is school related, but I always think about my anxiety. I fear a few non school related things, like my neighbor's dog (see my question "How to deal with fear of this dog? I know who owns her now though.) Well, I just have a sense that it bothers others. One example is the night before algebra 1 eca last year when I was panicky, couldn't sleep, and was too scared to wake my mom until 3am. Anyway, I just have this sense that my anxiety bothers others and I don't know how to hide it, How can I hide it?

Also, I take anxiety meds called sertalines. I take 50 mg daily, have since December 18th but it hasn't changed me at all. No side effects, not better, not worse. BTW I kind of like being anxious because I don't think I'd ever take anything seriously without it but don't want to bother others.