Opening 55 UTG in 6max will probably be marginally profitable depending on your postflop skills. It's definitely near the bottom of an UTG opening range but if you aren't comfortable playing OOP on boards with lots of overcards then perhaps you should pass 55 UTG.
The only way to know if a play is profitable is to play it thousands of times (or more, ideally) and evaluate the results. If you personally aren't showing a profit with it then there is no shame in passing and working on your game so that you are able to profit with it.