Could I Become a Lawyer?

I've been pretty lazy and undetermined in high school so far and i only have like a 78% overall average this year (junior), is it possible for me to become a lawyer? I have realized that I want to become one and stop being a lazy bum. My intelligence is not represented by my grades, I barely did homework and did quite well on the PSAT in comparison to those around me ( I did better than almost all of my friends), with a good SAT grade could i become a lawyer ? ( Dont take anything from how this is written its 6 am right now and i haven't been to bed yet