I have never properly masturbated before
Why have your never properly masturbated?
Because my mom always caught me off guard when I tried to masturbate.
My only real suggestion would be to keep trying when you think you have privacy. Masturbation can be healthy at a moderate level.
That suggestion is hard to follow since my mom is always under my nose when she is at home.
You can always try to masturbate at night when she is asleep.