You may offend him, sooo instead of telling him he's a horrible kisser take the lead. If it feels like he's trying to take over pull back shake your head no and tell him to relax then continue to kiss him the way you would like to be kissed. If that seems to forward then anytime he gets to aggressive pull back, then start kissing him the way you would liked to be kissed. It may take time and patience but if you really like him it will be worth it. Let us know what happens.