What are the odds against you having a tumor? What are the odds against high blood pressure, diabetes, or any number of conditions that can complicate or obviate your medical? I am one of the healthiest people on this board for my age (you can ask anyone who's met me) and my medical is a mess because of my gout, which only presented when I was in my forties. Anyone in your family have kidney stones? They're phenomenally painful, difficult to cure, and grounding.
There is one more thing you really should consider. The guy off whom I bought my bike was an airline pilot. Paid for all the ratings and everything, and pretty much gave it up and runs a motorcycle dealership. Why? He got married and had a kid, and really didn't like all the time away from his family. You should know that the needs and desires of a young man are not always those of an older man, and that the travel and time away that seems exotic now may not be so desirable later on.
Says me, get your degree. Go to a community college, then a four year school. Get a degree in a STEM field like engineering or math, something that you can use to get a kick-ass job. Then use the money you earn to climb your ratings. The airlines will still be there, so will the jets. There is a guy on this board who got an airline job in his 50s. But in the meantime you'll have a bit of life experience. You'll know yourself that much better. And if you do the airline thing at least you can do it without being knee deep in debt. That way if you decide you don't like it (lots of guys do) you can bail without destroying yourself.