SOS SEX HELP

Ok I am 21 and I've never been able to have a guy get me off. The only time I get off is when I'm on top and in control. I love love love my boyfriend and I recently told him about this and we've been working on it, but nothing is helping. I don't enjoy sex anymore cause we never finish at the same time and I always have to work to get off and it kinda sucks. Any suggestions????