Tell your parents then about you not being able to see far away objects. I have the same problem and wear glasses to correct that.
In regards to flying apache's / cobra's I can't really help you out a whole lot with that. If you can get lasik, I think there is a chance that you can still fly those, but your best bet is going to be to maybe talk to a recruiter, or a fellow helicopter pilot in the military.
I know you said you already do this, but flying FSX and doing some of the missions is actually a great way to get familiar with how things work in a cockpit. For example, I do believe in FSX they actually have the Private Pilot / IFR / Commercial ratings that allow you to get familiar with those ratings..that's a good start I think.
AOPA has some cool video's / courses that you can watch...you do have to register, but it is free.http://www.aopa.org/asf/online_courses/
I've been going through a lot of those lately as I've become more active with my flying.
Wikipedia has a nice breakdown on some of the instruments:http://en.wikipedia.org/wiki/Flight_instruments
Keep this in mind though. When you first start out, you are going to strictly be a VFR private pilot. Don't get to caught up on keeping your head in the cockpit all the time, as if you do, your going to have to forget that while flying VFR.
When I was your age, I was lucky enough to fly right seat in a Baron 55, and Piper Cheyenne II for quite a while...for 3 year's, I managed about 130 flight's in the right seat of those planes, and got use to instrument flying as that is how we always flew in those planes. I got to fly them quite a bit as well later on as I was getting my student license, and got use to keeping my head in the cockpit. My instructor's had the hardest time with getting me to keep my head outside of the cockpit and constantly scan the airspace around me instead of concentrating on my attitude or heading indicators.
Just keep that in mind.