You can do this. All you need is support, a brain, and selfbelief.
You have the first two already - the selfbelief is what you need to get you started and give you momentum to keep going. Think about what kind of weightloss plan you would most enjoy and could stick too - ie do you think you'd do better counting calories, or learning to eat intuitively? Would you prefer walking, swimming, yoga, going to a gym, or a combination?
Start by writing out all the reasons you want to change, and then plan those changes..then believe and do. and post here for as much support as you need