How can I stop worrying about this?

I'm a 15-year old girl with GAD (Generalized Anxiety Disorder), and OCD (Obessive Compulsive Disorder), and I constantly worry about irrational things, and I'm miserable. There's this one worry I have to get over. Every time I'm in front of, or near a light, I get nervous and can't act normal because I heard this girl say if you look at the sun, you'll sneeze (that is, I get nervous when I'm around somebody, because I'm trying not to act weird). And of course after she said that, everyone told her to look at the light and stuff. But after I heard that, it made me start worrying every time I'm near light. I always feel like something bad is going to happen to me. I know it's ridiculous, but I can't help it. Yes, I've told my psychologist about it and it didn't do a bit of good. And it's embarrassing to because she just makes fun of me. What can I do? Please help me, or tell me something to make me stop worrying about this.