Razor burn/ingrown hair ***HELP A GIRL OUT**

Summertime is coming up and guess what else is....yep the dreaded bikini season. I am a pretty self conscious person about the way I look. Most girls are. I am 5'3" and weigh 130 pounds. Not bad at all! What I hate THE MOST about bikini season is razor burn and ingrown hairs "down there". I've tried everything it seems. I shave btw. But I only shave once a week. I think I have sensitive skin anyway bc I CANNOT shave my legs every day. Otherwise I get BAD razor burn. But I've tried exfoliating, use a new razor every time, moisturize down there, and I've even sprayed alcohol to my inner thighs. BURNS LIKE HELL. I cant figure this out. Can SOMEONE, ANYONE, please help me. And possibly help others with the same problem?!