Female orgasm

I'm 21 and have had my fair share of sex for my life but I don't know if I ever orgasmed. No guy had made me feel so good like that but when I touch myself I can make myself feel so good that my vaginal muscles spasm but nothing comes out. It feels amazing, though. Also, I remember doing this to myself when I was about 5 or 6 years old so that's why I don't think it's an orgasm.