During oral sex I laugh! I want this to stop!

I have had 3 other guys besides my SO go down on me but when he does I'm so sensitive that I laugh. It's not like it tickles it's just so sensitive. I tell him that we need to practice with him doing it softer. He feels really self conscience about it now and doesn't like to because of this which in turns kind of hurts me. The other guys have made me cum but it took FOREVER . In your opinions his he doing it wrong or was I having it done wrong to me thus whole time and that's why I'm overly sensitive ?