If your under 22 and lose a ton of weight what are the chances of your skin tightening and if it is loose?

Depends on... ...What you mean by a "ton" - the more weight you lose, the more loose skin will be left behind; but age 22 means you were overweight for a comparatively short period of time - plus young skin recovers more quickly from such stresses. So there is a good chance that at least most of the loose skin will resorb by itself, given time.