1 yes push. You are most often ahead and you don't want to be outdrawn by a flush draw. Any smaller bet and you commit yourself anyway.

2 Yuck... another AQ, 67s or a set? ... His push is equivalent to a pot bet?... I'd like to say I'd fold this but in the heat of battle...

3 River check/call. Pot too big to fold, but I'm still worried.

I have read here that beginners do overplay TPTK and I've been working on avoiding being stacked with them. But if you lost all these hands you have had some tough cards.

I suspect both our samples sizes are too small to make definitive judgements on. It only takes a few tough hands to throw everything off. My KQs is twice as profitable as QQ, but I can't imagine I'm playing QQ so badly that variance isn't the explanation.