If Someone (meaning Me) Slacked Off In HS (but Got A 3.5) And Is Currently Enrolled In A Public State University, Is It Still Possible To Become A Brain Surgeon, Even Though I Don't Go To Harvard?

I didn't like HS at all, but all of a sudden I love learning and I read all the biology books I can get my hands onto. My favorite thing to learn about is the brain, and being on a rugby team I love a rush, so I figured if I put them together I will have my dream job. I have a 3.5 in college right now, but that was the tail end of my slacking. Basically i'm curious if I can still become a surgeon even though I figured it out so "late" (19).