Help about a guy..I no these questions are asked all the time but i really really need your help im so upset!?

First off you sound young and very vulnerable. That being said what you should really do is be yourself around him. If you're clumsy, be clumsy and stop worrying about trying to do everything right. Kissing isn't all that hard to do so stop worrying about that as well. It'll come in time. Anyways, if you still feel the same way about him 18 Months from now (see biological time-line for love), more power to you. And Good Luck