Agreer, at 26 I cant believe your parents were able to influence you about a life-long decision, despite you having bad vibes. At what point did you decide that this marriage has no hope, as opposed to you seeing advantages and disadvantages of marriage to him, and choosing to go ahead, as a 26 year old young adult. What tilted the scale?
I know of many divorcees (not all) who regretted their marriage and then regretted their divorce.
Hatzlacha, whatever you decide.