I'm scared of being alone and abandoned
Oh no, I'm sure no one will do that to you. People seem to love you a lot everywhere you go.
People abandon you when you are weak
I'm sorry you're so worried about that. It's totally normal for people to not want to be left alone.  I am sure that people are not thinking about abandoning you, though, so you shouldn't be scared.
I just feel so weak, and in the past I have been abandoned for such a thing. It just makes me think it will happen again and again.
I can assure you that it wasn't your fault. You are a worthwhile person, and people will not abandon you. Just focus on your strengths, and others will appreciate you for who you are.