Post Breakup Clarity- Need a perspective?

I'll probably regret after posting this but I don't have anywhere else to post. Highly introverted 30 M here, I barely have any friend only coworkers whom I don't share anything with.

Don't want to make this either a gender or MBTI thing but I've always heard that men have harder time moving on from a relationship. I used to mock other guys for being weak but here I am experiencing the same. Was in a 6 year long relationship with my ex GF (ISFP). Broke up with her 5 months ago and still miss her deeply. We were supposed to get married and I had so many overarching plans for the entire lifetime and all of that went down the gutter. No matter how hard I try to put these feelings inside a coffin and bury I can't seem to. This sh*t feelings affecting my productivity at workplace, like I need to manage things and all I see is her face and little things that remind me of her. Anyone with the same issue? Especially experienced people. Thanks