This is a really good idea. I used to do this in a journal, but gave up when I couldn't think of any more positives.

Dislikes
1. I'm clingy/needy
2. I'm lazy
3. I'm not smart in school and have terrible study habits
4. I try to fix everything, and blame myself for everything
5. I don't eat enough
6. I sleep too much
7. I hate my anxiety
8. I hate my fears of loud noises
9. I hate being disorganized
10. I am not social

Likes
1. I am independent
2. I am mature
3. I can bake
4. I am a good singer
5. I'm nice
6. I care about EVERYONE
7. I like helping people
8. I'm dependable
... can't think of any more