Infantry is awesome! You'll have a good time doing it. Do you want Basic Infantry or Mortars/Machineguns/Antitank? Anything you do, you will not regret later. It will be tough, don't think differently. But, just remember thousands have gone before you. If you want recon, I think they offer Recon Indoc. either in bootcamp or infantry school. Start swimming as much as you can now. Also, run a lot too. You'll benefit greatly. Running and endurance is so important in basic...recon too. The more you run now, the less stressed you'll be in either basic or recon. I think Infantry was the best decision I ever made. Every MOS in the Marines revolves around the individual rifleman. It really gave me an understanding as to how things work at the lower levels. I'll never regret it. Be positive about every thing you do, no matter how bad it hurts or how inconsequential things seem. Everything you do or your Drill Instructors do is for a reason.