need some help pls

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Heloo all I m trying to loss wait from scince a log time but I never ever sucses to rich my orignal wait....I was 55 k.g. before brith of my son ....now after 8 years I m 92 k.g. thts horibal for me ...whenever I start doing some exarsis and eting clean after few day ....I distrac from my gole and came back on my old eating habbits.....and never do any thing...how can I motivat myself for doing all this changes for my self to see myself in myy old day look ....I realy need some motivation