This is hard and I definitely feel for you 
….you’ve done a good job of identifying the pros and cons of both the big state school and the small school.
A couple of thoughts:
- Would you even be able to do a 2nd year transfer to the state school?
- Are your parents able to afford the state school?
- Do you really feel that you’ve given yourself enough time to try to adjust before you think of leaving?
If you were my kid, my advice would be to give it just a little more time, and make changes that positively affect you.
For example - the food - does your dorm have a shared kitchen where you could prepare some more healthful foods for yourself like salads, bowls, etc?
You don’t mention a roommate but since you don’t is it safe to assume they are, for the most part, kind and respectful of the small space you share?
Can you visit home on some weekends to get a dose of family and friends?
Is there a club you can join to share a particular interest with people who have the same interest?
Could you get an on-campus job that helps you make friends and feel more rooted in the community?
Does your school have a career center where you can get some help figuring out what you might like to study/choose for a career, including access to alumni in a variety of fields you could connect with?
To me, it sounds like what you are feeling is a little bit of homesickness coupled with a little bit buyer’s remorse, and both are totally normal. I think that only time will give you the answer you need.
In the meantime, I wish you good luck with the discovery, and hugs to you!