Hand 1 - Without a read I could see this being a fold but it is pretty close. I certainly don't think you made a huge mistake by calling, especially at the micro stakes where this could be a small pp just as often as it a big hand.

Hand 2 - this is fine. You have a good enough hand to call here but it certainly isn't big enough to build a huge pot with.

Hand 3 - Raise pre-flop. As played flop and turn are fine.