Shame

I am going through some really unpleasant times, and feeling many unpleasant feelings, but without a doubt the worst feeling among those is the shame, I feel so SO ashamed of myself, I did something really stupid and forgot about it, and it took quite a while to catch up with me, but the day before yesterday it finally did, and the result was disastrous. I have only myself to blame, I really wish I can take it back, but what's done is done, all I can hope for is that one day I'd be forgiven, until then I will have to live with the shame.