In hand #1, with all folding to you in the
SB, I flat call with a small pocket pair. Unless the
BB wakes up with a hand, you mostly will miss the flop, but so will he. Your small pair will be ususally be in a coin flip situation, at best, to his hand (overcards) and you are short stacked besides. I would save some chips and fold post-flop unless I hit my trips.
Choose a better time to push.
Hand #2...I, too, would shove.
Hand #3...Again you are short stacked. I would push my chips in pre-flop, thinking villian, being UTG with a call and a call, has Ax or a pocket pair. He is chip leader and can afford to call your all-in and still remain in good chip position if he misses.
Keep in mind, I am nowhere near the expert that many of the other posters here are, but the point of the forum is to see how others might play your hand. And BTW, welcome to a great, high quality forum. You should enjoy it here.
