Your pieces are all gathered over on the queenside. Why did you decide to open up the the f file? You've moved your rook off there, and white still has his rook there.
I'm not sure the Be7-d8-c7 moves was really worthwhile. If anything, it blocked in your rook more.
I may have considered a queenside castle. Looks well protected. If you're going to castle kingside, then perhaps starting somewhere around move 12, advance the queenside pawns? Or after 12. Rac8, open up the c file with with c4?
I had a game with black where I had a kind of hedgehog pawn structure.
But I could not find a good pawn break.
Can anyone tell me what I should have done at move 16? Because i can not find a solid move myself.
When i postpone the pawnbreak I get too cramped...