What causes condom to burn inside me but not when my bf dnt have it on? do is something wrong with me or its the chemicals that condoms give?

Chemicals: You could be sensitive to the spermicide that is on some condoms. If you use other birth control like pills, you could try condoms with no spermicide. That may not cause the reaction. Different types of condoms may be better for you as well.

Burn with condom: It may be that there is less lubrication and more friction with condom. Type of condom matters; lubrication is essential. There may be a chemical associated but this is unlikely unless latex allergy exists and condom is latex.