Flinching at sounds

Any advice on how to get over or chill out with random startle response. Partner and I confirmed we are going to DC for 4th of July and going to a baseball game and hopefully to see fireworks on national mall. Hate to cancel our plans but I absolutely can't stand the loud cracks and booms of fireworks, I often flinch and everyone overreacts and it makes me feel really uncomfortable. I've always flinched/jumped at loud slams, bangs, pops and it's not a surprise to my partner or anyone else as most know my story but I'm just over trying contain it and hide it. Any tips or ideas to help anticipate loud sounds would be great.

Also Im military and I actually don't flinch at work I've been told to do what I do there but honestly I'm not even sure what's keeping me from jumping out of my skin at times.

I do the whole, I need to get up and go to the bathroom or need to stretch bit but it feels incredibly obvious in my head that it's clear I'm removing myself on purpose from stuff and I just don't want to do that shit anymore.