How to deepthroat?

I feel really embarassed because I gave this guy I recently met head and I haven’t been able to make it come and when I’ve done it before on other people I’m usually good at it and they come. But I seem to do it wrong when I’m with him and I’ve asked him what he likes but he says he doesn’t know but he seems to like it when I deepthroat but I’m not very good at it as it’s kind of big. Does anyone have any advice on what to do?