Masturbation... It doesn't work for me, is that normal?

Pr
My boyfriend and I decided to slow down on the sex. it's been close to a year that we've last had our time. So there are times where I crave it but to be respectful and keep our promise, I don't ask. So I decided to try and pleasure myself. Nothing happened. So I did research and bought a vibrating dildo... Nothing is happening. I have used it with lube and porn. Nothing. I can't seem to get myself on. It mainly sucks the most when it's close to that time of the month where I crave it the most. Although, is this normal? Has anybody been through this and found something?