I WANT TO JOIN THE MILITARY

I've been struggling and stressing with life lately. I am 17 in high school; don't live with my parents, in fact with my 18 year old sister who is really irresponsible; I have a 4.0 GPA but only got accepted to two universities and felt very, very disappointed at myself about that; I pay bills; I'm adulting since I was 15 pretty much. And no, it's not hard, and it's not the end of the world, and others have worse things to deal with but anyways. I am looking to get advise and help from any women in the military field. I suffer from Sports induced asthma which I am working on now, I do a bit of weight lift, I have to lose 10 lbs to join, I can't do any pull ups at all but can do the rest. My worst fear is messing up with anything and not passing boot camp. Anything else I believe I do have. Like anything else this might be a new experience and can learn it but I would love any help okay how to prepare and what to do, is there women who can still pass boot camp even if they fail a bit depending on the situation/condition? I also might join after I graduate college because military is on my list but not right now that Trump is President plus I would like to have a title and know what to do after the military if I get in.