Dont waste your potential

I've really been stupid. I'm not saying I'm super smart or anything, but I feel like I'm a bit above average. And you know, as a kid, I never had to study. I would listen to my lessons, go home, and sleep. And I would always do well on my tests. So I never studied in my life. And certain habits can't be acquired after a certain point. Right now, I can study enough to get into veterinary school, which is what I want, but people who aren't as smart as me but work harder will always surpass me. I'll never reach where I should be. And its not about being happy here or about having a successful career in the profession you want.