Listen to Bobby Balsa. Exellent advice. Hobby shop owners may be the salt of the earth but they have too many things going to give you the time required. If there is a club near you the Hobby Shop owner should know about it and direct you there. He would probably be a member as well. You certainly picked a lemon when you got the Zagi. I've been doing this for years and I still wouldn't want to recommend that airplane to a beginner. Your hobby man should have known this before he sold it to you. There are many trainers, both sailplane and powered. The nearest club is where you should go to find an instructor. Take his word for what aircraft to buy.
Most clubs have instructors and maybe even a buddy box. This is not a skill you can learn by listening to someone who is standing by your shoulder. Don't give up, just change your approach to beginning the most fun you can have staanding on the ground.