Where is it possible for me to get in, and where is it possible for me to transfer to?

I’m a high school junior, I have a very muddied resume as of now, and I was wondering, 1. where I could potentially get into out of high school, and 2. If it was possible to transfer to a better school after the first year or two of college.

Here’s my situation:

I recently scored a 2200 on my SAT, but (the “bad”) I have a 2.5 GPA. I really don’t know why I slacked off as much as I did, and I also know it is far less than optimal. I regret it entirely, but I’m also very concerned about what I can do with my future, college wise. If I can’t get in anywhere decent right away, and assuming I did very well my first year or two of college, what is the limit on where I can go?

(Here’s the other stuff)

My extracurriculars + Miscallaneous: President of my debate team with State + National accolades, involved in 3 EC’s, 500+ hours of comm. service with underprivileged children, and 2 internships which I consider to be very accredited.

To condense it a bit, where should I apply to / where could I get into right away, and is transferring to a better college later on in the realm of possibility?