How to deal with over excitability?

I get really excited about stuff really easily. At times I talk really fast and can be really loud, but I don't realise that I'm doing it until someone tells me to turn it down a notch. I am really enthusiastic and try to be positive about stuff, but a lot of people find me annoying because of this. I have random bursts of energy, so I occasionlly skip or jump to places (not helping on the popularity or people's image of me). My friend said I sometimes over react and feel too deeply about stuff, which made me feel bad. I really try hard to do the best at everything I do, but people have called me a teacher's pet for being enthusiastic and excited in class. I've always been like this. Is there something wrong with me? Is there something I can do to get it under control?