I refuse to go to funerals unless I knew the person very well. If I do go as a comfort for a friend, I never go beyond the foyer of it. If this is too much for you don't even bother going.
Ask yourself, would you put someone in jeopardy, just to be a comfort for you? And jeopardy I mean causing an effect that could create a path to a flashback?
If the answer is no, be your own best friend and forbid anything in your life that would cause jeopardy for you.
If others don't get it,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,screw um for not understanding,,,,,,,,,,,,and don't riddle yourself with guilt that is not going to help you, but eliminate you from moving forward.
What would the most endearing person from your childhood do, if they were the one to make the ultimate decision?
Don't be so hard on yourself.
And hopefully in the future you will be able to use the glorious word no, way before you start getting yourself into a fit.
The quicker the word no is used, the less trauma and stagnant behavior will intrude on you.
hope this helps,,,