First, worry about making it into the military itself.
1st class on PFT
20/20 vision corrected
Infantry MOS
100+ score on GT
Volunteer
No history of mental illness
Expert on marksmanship test
Those are just SOME of the things you need to even qualify. It's not like the movies. It's basically hell. You stay quiet for days, staying still, moving slowly, you have to remain hidden and blend in with your environment, shit your pants, provide recon, it's not fun. Shooting is just part of the experience.