When you are heads up you have to be agressive but don't get tied to a hand.
Generally its good to attack when you have the button and defend when you don't.
so raise when you have position and call unless you have utter garbage when you don't
Basically take calling out of your game at this point, its about high cards and pairs. Either check/fold or bet raise. If there are draws on the board make sure your betting enough to make sure the pot odds
don't make it correct for them to call anyway.
You won't win them all but you should get your fair share. Remember you are both paying blinds and antes usually at this point so the pots are all worth winning even if you don't have anything. Most of the time the other guy won't have anything either.
Just keep it up and it will get easier with more experience, just don't play timid or very tight. If you keep your bets and raises to the same amounts (compared to pot size) then you will be hard to read. As they say practice makes perfect.