I want an opninion on the following hand. I think I made a major mistake preflop. But what about postflop ? Villian stats are 33/17

1st mistake: 2NL has this name because you MUST play with 2$ not just with 37cents.

2nd mistake: Fold pre! If you want to play SC or 1GSC raise them!!! In a full ring I'm not going to play SC by the way, expecially from MP.

As played: you have 2pair on the flop but the board is quite wet so I would have bet something around pot => 0.16/0.18
I would have also bet something around the pot on the turn => 0.50
I would have shoved the river

Hi! Thanks for clearing things up. So i should play max buyins. I heared some advice to play short multy tabling. So I usually min buyin.

That's called the SSS (short stack strategy) but you need 20bb per table. You're going to turn a cash game into a SnG basically because everytime someone raises and you have a good hand you have to move allin and so on. I don't know this strategy at all, so I don't want to tell something wich is not true... Anyway, get 100bbs and play poker... I think that's a good chance to improve you're postflop skills

Buy-in at least 100BB, buy-in 250BB when you've got better postflop. Also don't openlimp ever unless you come up with extremely good reasoning to justify it which will never be the case at NL2. So open-raise or fold. Exceptions are some hands that you can complete in SB and obviously some hands you check in BB.
Shove flop. $0.68 into $0.2 is just ~3.5x pot which may be a big overbet but the flop is wet, you got top-two, you're 3-way and this is NL2, ergo fish stack off with any flushdraw, pr + straight draws, TP+ all the time for that price.
As played call obv you're good often enough that folding getting 4/1 is a disaster.
If OOP shove river yourself, as already mentioned you're good enough often enough that you can't fold anyway and you're in danger of missing value from 9Y, maybe even 88 and 7Y, which they may or may not check behind but they'll just about always shove better (/TT likely) and people rarely bluff-shove when you're that short so you're likely isolating yourself against a stronger range than the one that calls.