Will removal of bonding change the structure of my teeth and make my gap bigger?

It is likely that if you have the bonding removed the teeth will look smaller and the space larger.  It might be time to replace with veneers for a nice, natural look or consider orthodontics. Good luck. 

Hi
First of all we need to know why bonding was done for you. If it was done to close the gap between teeth , then definitely the removal of that bond will create a space. If you are not happy with the bonding finish or Color or shape , you can think of ceramic veneers. They can be matched well with your existing teeth in appearance, and doesnot get discoloured. It has a long life. Please do consult your dentist.
If you are in India then I would suggest you FMS Dental Hospitals for any advanced dental treatments.

Without photos it's hard to tell
But if you don't like the results of your bonding, then there's a fair chance the original dentist didn't change your tooth underneath.  To close a space, expert cosmetic dentists will usually place some bonding below the gum line to make the shape look more natural. This will sometimes be done "prep-less" where no drill is used, or "prepped" where some of your natural tooth is changed/reshaped first. My suspicion is that if you want your bonding removed, it does not look very natural to you. And if this is the case, your first dentist may have only placed bonding on top of the teeth without "prepping" them. If the teeth were in fact "prepped" then a great cosmetic dentist can recreate your original look from past photos, etc.
Yes bonding can be removed without hurting your tooth
Bonding can be carefully removed with special instruments that exclusively remove the material without altering or damaging your natural tooth. As long as your first dentist didn't change your natural tooth, you can 100% get your natural appearance back without damage to them.
See an expert cosmetic dentist
Whether just to remove the old bonding, or if you would like new bonding that better closes your space in a natural-looking way, be sure to seek a cosmetic dentist that can show you their OWN before and after images of exactly this type of procedure. (Watch out for "stock photography"... which has nothing to do with that doctor's artistic abilities. Any experienced cosmetic dentist will have these before and after images very readily available for you to see.
Best,
Dr. Jason