Folding AJ too much...???

[X-Man]

I have just finished 18th in $10 R on stars,had a couple of opportunities (in hindsight)to double and triple up with AJo.Hand 1: I am one of the shortstacks with around T$30,000, 1 MP limper next MP goes allin in covering me and limper I am one off button with AJo...what do you do?
Hand 2:UTG raise by massive chip leader I have AJo 4 or 5 more players to act I now have around T$20,000 what do you do?
Am I folding AJ too much when I should be gambling more with it to double and give myself a chance of winning,I really hate this hand and end up folding it in most situations....any thought or advice would be appreciated.