What is wrong with me?

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I'm 18 now, no job, no money, can't afford to even go to a community college, I have a long distance relationship that's probably going to end soon because my significant other thinks I have nothing to offer them, I'm fat and covered in stretch marks, I have no goals or directions, no friends that invite me anywhere, I've always been garbage at school, I have no directions and I'm so lost. I feel like a child still, like mentally I never got older only my body did.
How did my life get so fucked up? Why did I end up like the way I am? How do I fix it?
I've been trying to take walks every day to help me lose weight and it seems to be working, I want to get a job but have no idea how and I'm too spergy to figure it out. I just want help with life. I don't know why but I'm just generally a disliked person, yeah I have fun with someone one day but then they never want to hang out again.