Obviously, it has nothing to do with a racecar? It's about him being with a girl who's been hurt before, and she's pushing away her friends and him. It's like a break up. "hope to see you at the finish line" means that I hope you're alright, and I hope to see you doing well later on in life. He's just stating that he'll always be there for this girl, and that she had to go her own way while he went another.
It's about love.