I'm depressed on things I'll never do, that others DO?

I have this depression/confusion that won’t leave because I constantly compare myself to others who are doing something ‘cooler’/more exciting and I have this insane crushing weight on my mind.

I’ve done a lot in my life, did medical rescue/evac/fire for 11 years, wrote a book, traveled, taught myself how to shoot, sky dive, ride motorcycles…yet I deny all this and its like ‘well, I never was a paramedic, only an emt’ or ‘Sure I got good at guns, but I never was in Special Forces so I really am just a fake poser.’

I was really brought to my knees about 3 months ago by this girlfriend I had who worked as a flight nurse on helicopters, she would brag all the time about how cool the mountains were, how many people she saved, how cool she was, etc etc, further she’d tell me how my stuff was boring (rock climbing, cliff jumping, shooting etc) this ate at me so insanely bad, I would NEVER get to ride in the helicopter and save someone on the mountain, or see the city with night vision goggles, god even just typing this I feel worse and have regret.

Further, I have a lot of ex-military friends and I feel like I was a coward or weak, or a joke since I never ‘proved’ myself by seeing combat, or jumping from a plane etc.

I talked to some of my friends and they are like ‘you’ve done a lot in your life’ but in my mind its like ‘but…but…I havent seen the city from the air with night vision goggles, I have paratrooped into hostile territory…I havent done ANYTHING!’

Thanks for any advice