Squirting?!

So I’m in my late 20’s for context. My boyfriend tells me that sometimes I leak a little when he has his mouth on me, but I don’t really squirt. Frequently after an orgasm my bladder has felt really full even when I didn’t have to go to the bathroom before I had sex. I think I could squirt, but I don’t know how. I’ve tried bearing down and relaxing but nothing comes out. So if you’re a squirter how do you do it? What was your first time like? Do you have any tips for me!