Sounds like you need to acquire a sense of apathy and get rid of the entitlement? Ie, when you pile all the chips in the middle good with further streets to come, don't give a **** on the run out
Sometimes to reduce stress and swings, a low ball approach can be wise but if you're exercising good bank roll management then it can feel like leaving money on the table by passing up on potentially thin edges - eg, check jamming a combo draw on the flop etc.