It's taken him quite a while to say he doesn't like what you do, which suggests to me that he is just as embarrassed about talking about it as you are.

But, ommunication is key, you need to ask him exactly what he wants and do it. It's not that your bad at blow jobs but remember - everyone is different, we all like different things and maybe it's worth trying to find out what your bf really wants..

I know it's embarrassing to talk about it, but if you've been going out for over two years, you should feel able to speak to him openly about it. I am a firm believer that if you are in a relationship and you are sleeping with someone you should be able to talk about it freely - you should be comfortable enough to do that, otherwise you shouldn't be sleeping with them - but obviously that's just my opinion.

Try talking to him, explain how you feel, see how he feels and what he wants and take it one step and a time. Who knows? It might improve your sex life beyond what you thought was possible.

If he has given you specifics, then you can change things; if he just says he does not like it the way you go about it, then he is playing games. If you cannot talk about, and get some useful feedback, then it is not a worthwhile relationship.