Help!

MM

I love my boyfriend, we have been together for a year and honestly the sex as pretty great, but one thing I can never get over is how not terribly, just not great, he is at going down on me. When he is just teasing me it's great, makes me squeal and my toes curl, but sometimes when he tries to make me cum instead of just teasing me it's so bad! How do I tell him that it's just bad/ how can I fix it so that he actually makes me feel good?