Am I doing something wrong?

[mgp]

Tight-Aggressive play doesn't constitute a 3x BB raise. A tight aggressive raise is more along the lines of 4-6. You played the set okay, it was merely a bad beat--however I think what could help you most is calculating the pot odds. Keeping with your style (which you should switch up every now and again) make sure that your bet makes it tough to call, or at least if he does call- you know you could be beat/or that he could be on a big draw and to be careful. I think you could benefit from playing more aggressive when you have the best hand, or even try to pick your spots better in order to find out where you're at. Look up some videos on "small ball" poker by Daniel N. I think that fits the style you like to play, and with a few improvements to your game you should be alright. Good luck!