Can i eat normally and still get results with P90X?

I have an average body type and i've decided to do P90X to get in shape over the summer. I eat like a normal teenager, occasional Chickfila here and there, Outback with the family getting me a nice ol' steak and maybe a cookie or two when my sister bakes. Most the time i eat whatever my mom cooks which is like stir fry beef, spaghetti, potatoes and baked chicken, etc. I also drink sodas, but of course I can cut that down to mostly water. Can I get results with P90X with my current diet? I'm not looking to get to bodybuilder status, just get a little more healthier and add some muscle before go to college (currently a senior in HS).