I'm 24 and was also losing hair––for a real young guy, I can imagine it is pretty intimidating to shave, because you're sort of in this Catch 22 where you are balding and everyone knows it, but others might see you shaving your head as a bad thing.
Let me say that you've got a good head shape for shaving, and if you want to give it a whirl, try it!
If you find you like the sly look, OWN it, like the days when you had a full head of hair. That's one of the best parts of shaving your head. You're making the choice to adopt a new style, and you make changes to your lifestyle (work out more, dress better, etc) to fit your shaved dome.
Also consider (if you can) sporting some facial hair to compensate.