Talk to Dentist on Dental Bridge Mishap

As you can see in my photos that I have unit dental bridge. The reason I had this on was just a gap in my front teeths. So my mistake was that I had consulted a wrong doctor and he gave me the option to get the bridge procedure done instead of a braces. I didnt have knowledge about these thing back then. Now its been like 4 years i had this on but still it's affecting me too much. Its a zirconia bridge divided in 2 sections. I am not satisfied with it. Its uncomfortable and sometimes irritating me from the back side. Also there is a gap between my bridge all of a sudden. It wasnt there before. Its affecting my mental health too much and give me too much stress. what should I do? The doctor had already filed down too much of my natural teeth, so if I want to get it replaced how will it affect my natural teeth? Wouldnt they be gone? Also what other options do i have other than replacing the bridge? Please help me. I JUST want the permanent solution out of it. I am just 29 years old.