2 knights vs 1 knight 1 bishop
You didn;t post the whole game so we relly dont knwo where u went wrong, but if you could lock all your pawns onto light squares (for example, an eventual c5), then his bishop is relegated to a 'stopper', if even that, giving you at least SOME advantage.
Also if you traded a knight for a knight here you would be objectively better as all the play is on one side of the board and your knight covers all the squares while his bishop only half.