Hi,
Well, body hair removal is really a personal decision. I'm a girl, but I go to the gym and when I look around, I see no guys with shaven armpits. I guess it is becoming more of a thing recently though. If you want to try shaving your armpits, just do. It will grow back if you don't like it.
Just make sure to make them wet in the bath/shower first, use lots of shaving gel, and use a new and sharp razor. Be careful not to cut yourself. It's really no different to shaving your face, which I am assuming you already do.
Not unless YOU want to?? Honestly, shaving causes skin irritation & ingrown hairs. It becomes thicker and course. It is unnessery. If you do shave it would be for appearence only and 99% of women would find it odd to find a man with no under arm hair. :)
NO your a guy and u should have pit hair ... :-D