I think everyone reaches a point in their lives where they wonder why God put us here and what our purpose is. Believe me, I've been wondering that same thing since I have been unemployed. I feel like I am just wasting my life since I do basically nothing and I'm not satisfied with basically any point of my life, at the moment.
Keep your head up. Focus on the things you do right. You work everyday, you are providing for your family, then you are making a difference in this world. Focus on the things you can give back to the world that was given to you. Make personal records in the gym if that helps your confidence.
Personal Trainer- ACE, NASM AFPA; Nutrition Consultant- AFPA
"I can do all things through Christ which strengtheneth me." - Philippians 4:13"