Girls Only:How to masturbate,First Time?

I'm 13.Last night while in bed I felt ticklish down there,so I started to rub a little on what I think was my oris,a little pea sized thing above where I urinate and it felt really good,my hips started to rock and I started squeezing my legs together.I had to do it for along time and I had these moments when I thought I was going to explode, but I wasn't wet or anything.I feel kind of weird after doing it but I wondered if I could try again.So I did,but I poked a little bit of my finger inside but it HURT so I went back to what I think was my .This is my first time please give me tips on what to do?