razor burn

so i have tried many products to shave with. ive tried many razors. 5 blade brand new out the package blades and no matter what i use i always get super itchy and i get really bad razor burn. Im soo tired of it!! i just want to have a smooth clean after shace with no after effects!!! idk what to use anymore. i havent tried Nair or veet and im kimd of scared to. i have really senaitive skin. does anyone have any suggestions or similar problems if so what do u use...