I should.
1) I should be optimistic.
2)* I should persevere, I cannot _________. I cant, I cant.
3) I should stop my horrible bad habit.
4)* I should learn how to stay at home.
5) I should find a hobby that is introvert.
6) I should make myself busy.
7) I should find a bisexual friend.
8) I should stop being a nuisance if im bored.
Thanks a lot david.