if i go back once again it's like i learned nothing, standing at the front of the queue heading for trouble

i have two visions in my head - one of me in the past and one in the (near) future.
she is wearing all black - skirt and shirt looking adoringly that guy.. that morning she woke up at 5 a.m and got herself dressed, did hair and make-up, nails were done evening before and before the event went to work to serve other people. she was ready to be that evening's princess, but didn't catch really his eye, because in his arms was pretty red-head.
she will be wearing sexy black and beige unique designer dress with high black heels, probably upstaging every female that eveing, make-up done my a friend who is make-up arist, hair by her too, nails by professional, slimmer than ever. that morning she'll wake up at 10 or 11, because beauty sleep is necessary, spend day with her friends who'll make her pretty. everyone will notice her, they will be greeted by her with smile on her face, but look in her eyes is not soft and adoring - it's full of envy. she might be the star of the evening but he has eyes only for someone who looks like a wet kitten.
it's like i'm talking about two different persons. only the end will be the same.. what should i learn from my past experience that the next one wouldn't hurt? or hurt that much?