I don't like my boyfriend when we go out?

It's a huge problem if you or he feels that it is; strangers online can't decide for you.
Do you have a best friend? What does she say? Get together with friends sometime when he's not available and ask them if they notice it, are bothered by it, or think that you are too uptight about it. Often times your perceptions about someone you are with are largely a reflection of what you think others are thinking. If they brush it off as nothing, then see if you can adjust your own way of thinking. If you can't - consider what the next step will be. I see nothing wrong with saying 'I like you but I don't think we have a long future together.'

If everyone you know thinks he's fine and you are too upset over nothing, it might be a good time to examine yourself. Being ashamed or embarrassed when someone is doing something truly awful is one thing, but if they are just boisterous and all over the place and everyone enjoys it, then what is really going on in you? Jealousy perhaps? A need to control? Often it's the sociable people who last the longest in relationships because they aren't hemmed in by the constraints of one person 24/7. None of us are 100% compatible with someone, so we need outlets for what is different between us. Good luck.

It sounds to me like it is a problem because you have asked this question. From what you say it doesn't sound like he is doing anything wrong. But he doesn't necessarily have to change his personality fundamentally to help with this either. And it sounds like your reaction is over the top and you are punishing him. The solution probably lies in the middle. Some times relationship counselling will get each person to look at each side of the problem from their own point of view then agree to modify both of your behaviour to make it easier to get on and get over this. He calms his behaviour a bit, but it doesn't change his personality and you relax a little more and try to discover why you feel this way (is it how you see other's perceiving you?) Also with things like this any added stress you might have in your lives, like bereavement, losing a job, or even not getting enough sleep can really put a lot of extra pressure and make problems seem much bigger than they are. It sounds like you do love him, and if he loves you then it's worth trying. I hope things work out for you guys.