I can't do it!! help!!

My husband and I have tried to have me squirt for about 3 years now. And I can't?! I've tried everything and so has he. He always makes me cum, anywhere between 2-6 times every time we have sex. And I think I'm broken lol. I just get too sensitive and get scared for some reason and I've never been able to squirt. How can I learn to? What do I need to do?