Preflop
This is where, all the problems in the hand begin. A suited rag ace like A6s is NEVER a call from this position, and especially not against an UTG open. Kicker domination is a huge issue against a tight range, as the outcome of this hand illustrate. Also when you call, 4 players behind can put in a squeeze, which will force you to fold without seeing a flop.
So first of all STOP pushing that call button all the time. Given that the open comes from UTG, this is an easy fold most of the time, but if you have HUD-data or other reads suggesting, that Villain fold to much to 3-bet, you can attack him. I would maybe 3-bet this 20-25% of the time and fold the other 75-80%.
Flop
You brought yourself into this situation, where you hit an almost perfect flop for your hand, so you are kind of committed to call at least one bet, but your hand is already no more than a bluff catcher. If I find myself in this spot after defending my blinds for instance, I am definitely not looking forward to the turn and river.
Turn
You picked up an OESD, which kind of commits you to call once again.
River
Your straight draw missed, and now you frankly have a very easy fold. An UTG raiser has all the AK, AQ etc. of the world in his range, and how often do people actually tripple barrel bluff in a micro stakes tournament? Its nowhere near as often, as people make hero calls, and getting away from a river situation like this is key to long term success.