I don't think my family understands that I'm an adult, what should I do?

Whenever I go out with them now it seems like my opinion does not matter and that they seem to think of me as a little kid that they need to make all the decisions for. Like, I wear a size Large or XL depend on what the shirt is like and when I was younger since I was a bit chubby I wore bigger sizes. Now that I'm skinny, I like clothes that are snug and when I pick them out they put them back and get clothes that are bigger and have more room because "they like it when their clothes have room." Then, they have a tendency to twist my words or misinterpret them, like we were talking about the "Hunger Games" and I said I own it and am just now getting around to reading it. They think I'm doing it because it's being made into a movie, truth is I just heard about it a lot and decided to look into due to the buzz. Then I mentioned that in the movie, Katniss is being played by Jennifer Lawerence who is playing Mistique in X-men and they took that to mean that I only want to see it due to an attractive actress is playing her even though I didn't mention that or her name. They don't ask where I want to eat or where I wanted to go on vacation and I am expected to go along. I feel like I'm not being treated like an adult and I honestly cannot wait to graduate college in a year so that I can leave the state and go find a job somewhere else. That's another thing, I have had a really really stressful five months and am enjoying summer by not doing anything between when I came home and when my summer classes start because I feel like not doing anything and taking that time to get my head together and relax. They think I am not accomplishing anything and I need to apply for a summer job but there is nowhere hiring and at this point in the summer, there would not be much of a point to job hunting. I'm just wanting to relax and unwind, they don't get it. What do I do? I understand I sound selfish but it is how I feel.