I'm 5'9" 5'10" and weigh around 140. I haven't rode many dirtbikes but have drove a few ATV's. I would like to get a dirtbike but don't know exactly what I should be looking for. 150's seem small and I don't want to go buy another one soon because I grew out of it right after i were to just buy a new one. The bike would be used. And I'm still only 15. I know there are a lot of questions on this subject but I want something more personal, like about my situation.