Masturbation Advice

Hi! I’m 16, and I have always felt guilt around masturbation. Recently I’ve felt it more, i don’t know why but I do. Idk if it’s partially due to the fact that my boyfriend doesn’t know that I masturbate and he does not. I do not watch porn, or think about him without his consent while doing it ofc, but it makes me feel kind of guilty. I know it is my body and I can do with it as I please, but I feel weird idk. I also do not want to tell him that I do so because we just haven’t gotten to a place where that would be a normal thing to say. Any advice?