Effective stacks 300

Hero AhJc

Hero raises to 12 from middle position pre flop
Two callers.

Flop Kh 10h 2c

Hero checks, one check behind, Villian bets 20

Hero raises to 60, one fold, villain calls

Turn 6s

Hero bets 100, Villain calls

Turn 9d

Hero checks, villain checks.

Villain has QhQc

Second hand

Effective stacks 100

Hero raises to 10 from middle position with 6c 6s

Same Villain raises to 20 , hero calls

Flop 7c 5s 3h

Villain bets 15, hero shoves for 80, villain calls

Turn 9d, River 2s

Villain has Kc Ks

Bad luck or am I just a donk?

First hand shove river

Hand 1: Sizing is OK but don't take the check/raise bluff line against a villain unless you know he is likely to fold. At 1/2 you will run into more stations then nits. Check/raising with your hand is a bluff on this board because the 3 non-heart queens are the only totally clean outs.

Hand 2: Your stack is too short to be raising with a low pair from MP. When villain min raises you are stuck calling but it's a pure set mining situation, check/fold when you miss the flop because you probably have 0 FE. The min raise is a big pair too often to do anything else unless you have specific information on the villain.

Hand 1 check raise much bigger. I'm happy to raise get it in with that much equity while maximizing fold equity.

I don't really fault you a ton for hand 2, tbh.

Since you gave no reads, I will assume generic opponent (Meaning I have no clue whats going on). With no reads, I hate both hands.

I only get frisky like this when I have really, really good reads.
Like the first hand: Does this guy float a lot, so a double barrel shows him you have the tops, and blows him off his mid pair? Does he only continue with a top pair, does he chase?
If I was V in hand one, Im totally confused by the pre raiser check raising me.
I don't think a river shove does anything now unless he had a draw and missed.
Mark it down, that he can't fold QQ when a K is on the flop... seems pretty crazy.
Maybe you did something in a previous hand that caught his eye...?

I don't get Hand 2 at all either... MP 66, and you want to play for stacks?
Is this a tourney or a cash game?