Re: 'Be honest with yourself', 'NOT STILL HUNG UP'
I don't understand the first part of the sentence, but if you are "still hung up on someone" it means you still have romantic feelings for the person even though the relationship is over. (Or, you might have never had a relationship, but liked this person for a long time.)
Just as I should be honest with you, a person should be honest with him- or herself. The correct preposition is "with" not "to."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.