This should have been in the intro section, but no biggie.
Rangering, like anything else, is 90% mental, 10% physical, in my opinion. Not saying you can be a lump of crap and make it through, but if you are mentally tough, it will pull your body through.
Seeing as how you are sixteen, I would search this site like you are doing, but also I would READ. Read anything and everything you can get your hands on......especially military history and things like "Charlie Rangers" and all the other books on Vietnam Rangers and LRRPs.
Start a PT program.
Welcome to the site.....
Oh yeah...Iming with other guys is straight up GAY........now unless ya put your sister on, you aren't going to get many Rangers wanting to IM with you.
Do some research, if ya can't find an answer to your question, ask it here in the appropriate forum.
EDIT: Spartan types faster then me......
A Co 2/75