Pee or cum?

Minnie • 19/England🌟
I've never orgasmed with my boyfriend before because I am always scared I will pee myself if I let him carry on licking me or touching me down there. I just tried masturbating to try and get myself there and I felt a little trickle when it felt good so I let go and carried on and I peed! Why does this happen??? Luckily I was on the toilet just in case this happened and I fully peed even though before I started touching myself I didn't need to pee. How do I get to an orgasm without feeling like I'm going to pee all the time? I'm so upset because I feel like I can't fully have an intimate connection with my boyfriend until I can let go for him and let him get me to the big O. What should I do?