"I couldn't help but say [I like you], because I wanted her to say it back... I'm such a loser" is a lowkey heartbreaking line. He still doesn't think his feelings are valid, and needs her constant reassurance.
see, the problem is that "stay with Anjou" and "become a proper adult" are two different things, but he's conflating them. When trying to talk to adults about his future, he can only think of Anjou. When trying to talk to Anjou about their relationship, he can only worry about the future.
The easy answer, of course, is to go to a cheap local college and start taking your Gen Ed courses while you decide on a major. While still dating your girlfriend, naturally. You don't have to live together, or even go to the same college. You can kick the can down the road when it comes to a career or marriage. Boy is stressing about this WAY too hard right now.