@Forever Alone,
Forever Alone wrote:....
I guess I'm not right for anyone out there..... Sigh. ....
Bullshit. You just haven't met the right person yet.
Here's an idea. Consider a fishing metaphor. You fish in a pond with fish. And you use the right kind of bait. Plus you fish in the pond that contains the kind of fish you're looking for, e. g. if you want to catch salmon, you don't fish in a pond that's only stocked with tuna.
By going after every girl you've tutored, you're sending out a desperation vibe. You're also likely to get girls who, as you noted, only see you as a means of improving their GPA. So stop doing that.
School is a decent place to look for companionship, but it's not the only one out there. How about reconnecting with your church? Many houses of worship have some sort of activities for singles because they have an interest in their parishioners marrying someone within the faith. Try Meetup.com and see what kinds of clubs are meeting in your area. Meetup is used for all sorts of get-togethers and interests. There might be people who want to go bowling, or play role-playing games, or watch classic movies, or learn to cook, or whatever. Go after your own interests but consider similar ones, e. g. if there's no cooking group for you and that's what interests you, but there's a group for candy-making, try that instead. It's similar enough that there's bound to be a lot of crossover interest.
Talk to your family and friends. Maybe they know someone, or know someone who knows someone. Go into blind dates with an open mind and a sense of humor. Consider the personals, or meeting someone online.
But don't just wait for an invitation, because it is not going to come. You need to take chances in life, if you want to get this kind of relationship. It is not going to be delivered to you on a silver platter.