Insecurities

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I have always wanted to have shower sex with my significant other but I have some back acne and scarring from it too and I'm really insecure about this for some reason? Like I won't even let him give me a back massage bc I just don't like him being able to see it. So when we shower we obviously can't have lights off but I do know when you shower the guy basically hits it from the back. Any suggestions? I'm fine with my face acne though because I've had it my whole life and I got used to it but this is new. I know it's normal and I shouldn't be ashamed of it but I am for some reason?