I'm sorry, I love this game so much (can't stop reading articles, studying etc), but I'm such a fishy stupid nit, and it's way too complicated for me, but I love it ahhhhh, please help me.

So, let's say we have like QQ. We raise in the middle position, button calls. Flop comes Tc 7c 3d. I cbet, he calls. Turn is a brick, something like 5h. I bet again, he calls. River is something like 2c completing a flush. We check, he shoves. What do we do? Let's say we have 50% of stack committed. He definitely takes this line with having 2 clubs, right? So I have to fold?

The thing is, I often find myself in these similar spots where I have a monster, but then the line they took just screams "I have a flush". Even though if you plugin similar hands into pokerstove it says I have equity of like 80% which makes it like I should snap call, but I make a huge fold cause I'm a fishy nit and I love this game but I just don't understand it at all, and I can't win tournaments ever and just finish in top 20-30 at best and it's frustrating.

Thank you guys very much.

I know your example is just that... an example, but there are many different variables that have to be taken into account to make the river call (on any hand, not specifically on your example hand).

First I'd say you need to be paying close attention and taking notes of your players. are they capable of bluffing here, or would they always have the nuts here?

How big the effective stack sizes are. Obviously, it's going to be much harder to stack off here with a single pair with 150 bb's+ then it would be with 30bb's.

Board texture. You should see a board and pretty much know if you're going to be able to double/ triple barrel. Have a plan once the flop comes. If you've bet 50% of your stack by the turn, I don't think I would fold to any river!