The Cottagers conceded twice against Brighton at the weekend as the Seagulls came from two down to salvage a point and the 24-year-old believes his side could have been further punished due to costly errors.
Mawson said, "It was a sloppy first goal that we conceded. We have got to man up and improve. If a man has got to go down he has got to go down, if a man has got to clear the ball he has got to clear the ball. It is a learning curve for us, but a point for us could be big.
"There are two ways of looking at it. We have played well and scored two good goals. At the end of the day you have to take what you can, but when you are two goals up you have to win the game, it is as simple as that.
"We have shown how good we are already. At times today we were unbelievable. It was a joy to watch at times. We picked a side apart that were in the Europa League [Burnley].
"We are conceding too many cheap goals. It has to stop - I won't allow it.
"We were lucky as well because Betts pulled off a great save for the penalty. Decisions do not go your way sometimes. We could have lost the game with the momentum that Brighton built up, but we have to take heart that we saved the point."