You will always show a loss from the blinds. That is normal. If your BB are 3x as big as your SB, then you need to find out why. You are probably calling or defending too much. Defend vs the right player, and be very choosy in your hand selection. If you are playing the same amount of hands from UTG as you are from the BTN, then you are not playing with any positional awareness.
You need to differentiate between players who are stealing your blinds and players who are playing a hand they want to play. Once you think you know which is which, then look at your hand strength. If someone is obv. playing a strong range, they are probably not stealing, thus you should only defend if you are strong. If someone opens their LP often if UO to them, you can re-steal more liberally.
But it goes much deeper than that. You need to think post flop play before you get involved from the blinds. Folding is almost never wrong if you dont know how to proceed on later streets. I will try to go into more detail later, or someone else will. But if you dont have a plan for post flop, folding will never be bad.