MP was A loose Reg.

Do I have to 3-bet here? I don`t like to 3-bet JJ vs early Position raises. Can I call the 3-bet it seems so weak but I have no idea what to do here.

OTF: just low cards nice Flop for me but still a ugly situation. I guess thats what I deserve for my bad Preflop play...

Looks good to me

Yeah looks good
Calling river wont be profitable

Calling this squeez is mostly for setvalue of course.
Flop is kind of borderline,he bets into two players so its close, dont know if he do it with AK, and if he do it, then your good to not proebet turn.
Not sure about flop, i think his range is pretty much most QQ+ here, he checked Turn for potcontrol because he feard a set, i think he has KK or AA.
I think if we call preflop mostly for sevalue it can be -EV to call this flop in some games.

Not poor preflopgame, you can only play sets +EV, but with calling flop you estimate lighter cbets,this is the problem, if you call for setmining (+ AK) and dont think he has worser on flop then fold flop.
I dont think he is cbetting every AK here of course, i see me fold and only play sets in this spot.

calling is kind of guessing he has some worser hands in his range, if so its a thin call, the more i think he has QQ+,AK and only cbets QQ+ the more i would just only setmine, if he cbets without hitting into 2 people with AK (you can discount this very much) then its like you play against half the AK, and QQ+ so you can fold.
I rarely see people cbet with air into 2 people, so because of this setvalue is higer and taking some cbets from weaker hands is lower in value.

It may look like you have to call the flop but i guess you dont have to everytime.