PLEASE HELP! I'm always farting and it's embarring?

I'm a teen, female, I'm pretty skinny, like 100lbs & 5'3 and I'm always farting for some reason! And whenever I finish eating, I just wanna poop it out right away. It's embarring cause yeah, I eat at school, therefore I do my business at school but when I do it, it's like really quick. Then I always fart :| What can I do to control it? It's usually silent but I think other people are starting to notice that I fart a lot...