To add to my post, if you're feeling depressed a lot, for whatever reason, then I do recommend counseling. It's also normal to feel that, at any age, but especially as a teenager. There are lots of therapies that help lots of people. You don't have to go it alone.
You're o.k. You're beautiful, and you're not weird or bad or evil. You're only 13, and your body is going through changes, especially hormonally. EVERYONE masturbates. It's normal! If you felt the need to do it 5-10 times a DAY, I might suggest counseling. If it's getting in the way of your daily living, maybe I'd suggest counseling. But once a day or every other day is NOT a problem. It's NOT bad. You are normal.
Have you been told that you'll be a ***** or stripper if you masturbate? This is NOT TRUE. It's natural. It's normal. If someone tells you otherwise, then THEY have a problem.
The fact that you want to find out more is encouraging. Keep researching medical info like on this site. You'll find that masturbation is a part of being a normal person. People with healthy sex lives masturbate. You're just finding out about sex. Take your time, worry less, research more.