Help, I cant make myself orgasm

Hi, im just going to get right into it. I am a virgin but I masturbate pretty often. I alternate between using a small g spot vibrator, a wand, or sometimes both at the same time. It gets to a point where I feel like I am about to have an orgasm and I get really close but I have to stop because the feeling is too much to keep going. It feels really intense and kind of like I have to pee but I know its not that. Any tips on how to let go and just let it happen? I feel like I am pretty relaxed but the pleasure is too overwhelming to get all the way off.