Shaving bikini area?!

Sammy

I have been shaving my bikini/pubic area for years now. I just use a normal razor (is that wrong?) I have never once shaved and had it nice and smooth, it is always red, bumpy and irritated. I have tried everything that the internet suggests to avoid it. I tried at home wax strips but they didn’t work. Any help would be greatly appreciated, I live in the Southern Hemisphere and would like to be able to confidently wear a bikini all summer without having to worry about visible red bumps around my bikini like