my experience on-line has been when peeps ask relationship advice, they already know the answer and are just looking for affirmation.
the backgrounds and grades are not the defining issues here. plenty of people have pulled themselves up from less-than-privileged stations in life. but the other behaviors you mention smack of control-freak and abuser-in-the-making. he's already manipulating you emotionally and not once in your post do you say you love him back.
you have your whole life ahead of you.
i wish i had listened to my mom when she warned me about my very similar situation at your same age. he wound up pulling a gun on me.
As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans.
– Ernest Hemingway