Always giving up by the third day

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Hello ,well here I am ,all over again ,its been two years and over gain over 18 pnds ,I've been feeling fat ,and I can tell I've gain weight ,but its all my fault ,I've got a problem of giving up by day three, I feel week and not motivated at all ,but I've been eating clean for two days but tmr is day three ,and I'll try to motivated myself to actually jog and but at least 500 cal. So I'll be happy to motivated ppl that are having the same problem as me because I know how it fells not being motivated:/