I think the people who will tease and make fun of you will burn in hell. Dont worry
There's a fellow out in Europe who has some muscle degenerative disability and he plays in an electric wheel chair with mounted M249's lol! If you have interest, you should just go to a field
make sure you have protective gear; helmet, elbow pads, knee pads to protect yourself as you stated you dont have very good balance.
Some motivation
http://blog.airsoft-squared.com/incr...n-airsoft-tank