Help! I Feel So Self Conscious About my Teeth - Seattle, WA

A dentist had told me he cold fix the tiny gap on my #7 tooth that was only noticeable from the side view but he filed my entire tooth to put bonding on that left my tooth very yellow and dull looking. The next dentist I seen shaved the bonding off the tooth so it is less yellow. Now you can see the composite filling (not very noticeable in pic) my tooth is no longer smooth and I'm worried that my tooth does not have enough enamel left to protect it. They also filed my front tooth that is shorter because I had a small chip. It had already been a little shorter but more so now. I wish I never let this dentist touch my teeth. Before the dentist pointed it out I never once felt insecure about my teeth, now I feel that my smile is very ugly. I really don't want dental veneers for I am scared to loose my natural tooth forever. What do you think I should do to improve my teeth?