Hi, OP. I was in a similar boat for a very long time. I've only just managed to get myself started over the past month or so and have lost half a stone.
From personal experience, the best advice I can give you is to pick a weight loss scheme that suits you (lots to choose from!) and just get started. Pick your favourite foods from within the scheme, make them often and savour them. Keep a note of your weight loss regularly and revel in it! Hang an outfit you want to fit into eventually somewhere where you see it regularly and get excited about it and keep imagining yourself wearing it.
If the weight loss is slower than you would like, keep reminding yourself that you're still going in the right direction. The only alternatives are to flounder at a weight that makes you unhappy or, worse, to keep gaining.
And most importantly, enjoy the feeling of improved energy levels and mental health as you get lighter, make better food choices and are aware that you're slowly but surely getting there.
Look for accountability too. Do you have a friend who would also like to lose weight? Or even post regularly either in this thread or in one of the other threads in your chosen weight loss method.
It's hard, I know, but you can do it. 