Some of that depends on you. The more frequently you can afford to fly - 2-3 times a week - the less money you'll spend earning your private certificate.
The point is - you're thinking in terms of months. Aviation is a journey. I started out thinking I wanted to train fast and go to the regionals. However, in my training, I discovered that I really do love flying small airplanes when and where I want on my schedule. I have a good career (I'm 35, it's a little different for me) and the joy I get from flying keeps me from wanting to make a hobby a job - because it would get old for me. It's just how I'm wired.
It takes a lot of time to build your hours - you may have seen the recent Commutair job posting where they want 1500 TT minimum to be even considered, and there are a lot of guys out there competing for jobs with way more time than that in their logbooks.
At your age, focus on the small stuff. Enjoy your time. Get your private. Take some friends flying. Take dates up. Work on your IR, Commercial and eventually CFI tickets. Go to college, instruct on the side. Enjoy it.
The most "senior" guys on this site - Calcapt, Typhoon, Doug...they'll tell you it's a journey, not a destination.