What are my chances of becoming a doctor and getting into a decent/good college?

I am now a senior, with around a 3.4 unweighted gpa and around a 3.8 weighted gpa, i got a 1460 on my sat(470reading and 540 math 450writing) i plan on taking the next sat in nov( should i considered pushing it back to december or january for a better chance of getting a better score?), i have very few extracuricular activites ( 2 or 3 maybe) My junior year was my best year ( i averaged about a 4.0, 3.6 first, 4.0 2nd, 4.4 3rd and about a 4.1 fourth) do i have a good chance of getting into a good college? what sat score should i aim for to really improve my chances? should i even apply to colleges with my low sat score and is my gpa too low, decent, or good enough to get into a good college?(considering colleges with good premed programs or 6 year med programs.) ( i dont really think i have a chance on becoming a doctor =/)(is there any thing i could do this year) all opinions thanks.