High School Diploma or GED?

I am so confused about school. Here's what's going on: I am a sophomore in high school and hate it, so I want to go to night school instead to get my GED, which I believe is the same thing as a diploma. Am I right? So I've been looking for night schools in my area and I have found quite a few that I'd like to apply to. I'm also currently in the process of getting a job at my local supermarket. The only problem is that I want to go to college badly to be a Veterinary Technician, but I don't know if I can do that with just a GED. I heard that with a GED you can go to a community college and then transfer to a state college... I'm just not sure if I can do all that. I'm only 16, that's a lot to think about. I mean think about it. Once I get out of night school I'd probably go straight to a community college. That's a lot for someone my age. I guess I just really have to give this a lot of thought.