I'm interested in joining but the army and marines have shot me down because I am to short. So I don't know if its worth checking the other branches. And even if I'm that short is there any way in fighting that?
It depends on what job you're going for. Most jobs involving flight (pilot, navigators) have height restrictions.
As far as engineers, infantry, medics, administrative personnel (etc.) go, no, there is no height restrictions--unless there is an accompanying medical issue (dwarfism, amputation). They say there are height limits, but if you are, say 4'10" and just a tiny person in general, you can easily get a waiver for it.