Should a teenager have to go to a day camp for the entire summer?

Well, they are your parents, responsible for your care, safety and well being until you're of adult age, so this is the decision they have made. And you're not going to be all by yourself at the day camp, i'm sure you will meet other kids your age and make a friend or two.

Your parents don't have to "talk to you beforehand".

They want you to be safe and out of trouble while they are at work - it's not because you've done something wrong. They don't feel you're ready to stay home alone.

Evidently your parents want you to have the summer camp experience whether you want to or not. It may be a once-in-a-lifetime chance or they may be planning to do something they don't want you to know about. I wonder which it is. Have you asked them why you are going?
I'd give it a try and see how I liked it. I didn't want to eat my first lobster either, but I did discover that I liked lobster. You may meet some people you really like and find out you can do somethings you have never had a chance to try before.
If you truly hate it, having given it a fair try, ask to come home.

theyre doing it to be nice cause they know you will have fun there, so just go and have a good time, my parents used to send me to camp too when i was little