Dude you can do anything you want. I was in a similar situation when I was in high school. My freshman year I got involved with the wrong crowd screwed around too much and also got a 1.7 gpa my first year. It wasn't until towards the end of my sophomore year that I started to turn things around. It was then that I started flying and actually had a goal to work towards. I worked my butt off, but was still only able to graduate with a 2.9. I ended up going to Auburn University to major in Aviation and ended up switching to Aerospace Engineering (I knew I wanted to fly for the military and I wanted a degree that was worthwhile), graduated Cum Laude in Aerospace Engineering, and now I'm currently in pilot training in the Air Force. I'm not trying to brag about my accomplishments I just want to make it clear that it's never too late and anyone can do anything they want with dedication and hard work.

Even if you ended up graduating with a 1.7 you can still turn things around. Enroll in a community college and work your butt off for 2 years then transfer to a well known reputable state school. Get a degree in something other than aviation, but continue to get your ratings and try to get your CFI so that you can build hours and make some money on the side. In high school I never realized that high school really does NOT matter(aside from applying to college). Your high school grades do NOT follow you, but your college performance will so make the decision now that you want to turn things around and I guarantee you can do it. At least you have a goal to work towards and that's half the battle. I saw too many "kids" in college that had no idea what they wanted to do and they were only there because their parents were making them. Being a pilot is one of those things that few people are "called" to, but when you know you want to be one nothing will get in your way if you really want it.

Best of luck to you. Let me know if I can offer anymore advice. Of course I'm going to tell you to enroll in AFROTC to get your school paid for and fly for the Air Force because that's what I did, but you can take any route you want.