Terrified to have sex...

So basically whenever I touch myself it feels like a pee ( I always pee right before so it’s not that) I’ve heard of squirting? I’m just so scared that somehow I still have pee and that I’m going to pee on my future boyfriend’s penis. I am most definitely ready for sex yet (I’m 15) but when I do I am so scared of what will happen I’ll be so embarrassed because it just comes out right when I am about to orgasm which usually freaks me out and I don’t let myself finish which really sucks. Any advice... I hate it I feel disgusted with myself.