HELP! Can't orgasm because of mental block

So I have been sexually active with my boyfriend for 1.5 years! He is great literally my sex god! I have squirted before but every time I get close to orgasming I get scared. . Sometimes I feel like crying. I am able to build up to an orgasm no problem. Also I dont masterbate but we have sex on the weekends when we see each other.

I want to orgasm but I think there is some mental block. Any tips?