Is there a Connection between Sila and Fear?

Is there a connection between Sila and fear? I find fear to be the main reason I practice sila. I would like to practice Sila out of loving kindness and a compassionate heart but I'm more worried about the consequences of my actions then being compassionate.And i don't know if this is selfish reason to practice sila but I'm really not keeping the precepts because I care very deeply about others or want to be Mother Theresa but because for some reason I never seem to get away with anything.And I always seem to get the results of my actions right away that I feel like I don't have a choice but lead some kind of moral life.Basically i feel like someone on parole.My question is: - Is it selfish to practice sila because you want to save your own skin? Or should it only be practiced out of compassion for others? - Is there a connection between fear and sila? Thanks