I so embrassed and feel bad about this?

I don't mean to be unkind but are you securing your pads properly? If you are and the period is really that heavy that you soak through in 20 minutes then yu should see a doctor. Usually the pads have a waterproof backing so I find this alarming. Are you soaking through or leaking either side because of an ill fitting pad? Maybe you need a different shaped one with wings? If truly you are soaking through go to your GP.