Can women get a disease or get sick from masturbating?

I’m a teenager and I’ve never had sex...but ever since my health class, I’m afraid that if I touch myself I’ll contract a disease. I have masturbated, but that’s it. For the past three days, I’ve had a stomach virus and I started to feel better today...but then I found a small red bump on my vagina lips really close to my pubic hair. It hurts a little, but not bad. Should I be worried?