what's with all the min raising? on the 1st hand you should raise on the flop to something like $10

on the 2nd hand i think the call on the turn is loose. you should just fold right there. on the river you should just flat call. a lot of strength has been shown. maybe even folding the river is the best plan after it has gone bet then raise. there might even be another raise behind you which you should definitely fold to (if it would have happened). as finished it went ok. but the player that raised to $8 could easily have had the flush. so you definitely can't raise in that spot. and it would not look like you're trying to buy the pot because of the strength shown by the other 2 players in the hand.

3rd hand - weak raising on the flop and turn. btw, BB could have 67 here and hit the straight on the turn. on the river you can't reraise again. you have to just call the his reraise.

4th hand - bet the flop! don't let someone draw to a free flush! i think you should be happy with how things went on the turn. you want all your chips in the middle in that spot. he might have AA or KK. he might AK though as well. i think you want all your chips in on the turn.

very weak betting all round i think. way too passive. and betting/raising is too small.