Is there my mistake?

[Heffer]

raise preflop (never open limp,especially not with a pp which can flop a pretty well disguised monster, if you haven't read this
then do. btw: read the whole unl essentials)

i also would reraise the flop, to know where you're at and to build the pot. also to avoid giving them the right odds.

a 2bb bet in such a pot is often a bet to let villain see the turn cheaply, cause the fear somebody might make a psb.

after that i think you would have a total different situation, with an easier decision