I've been in a similar situation.
13 months ago, I was obese. I've lost 33 lb.
The biggest single difference I've made, is exercise.
On Coronation Day, last year, I woke up, realised I had a significant birthday coming up, I was desperately unhealthy and setting a poor example to my children.
So, on Coronation day, I went out early, and tried the first Couch 2 5k run
It was 9 x 1 minute runs, with time in-between to recover.
It nearly killed me. At that point, I hadn't run willingly in almost 20 years.
I didn't even own a pair of trainers, and had my phone on speaker.
But, I'm a stubborn cow, and I refused to be beaten.
The next day, I went to my local supermarket, got a pair of unbranded trainers and a pair of ear buds that hooked over the back of my ears.
I didn't quit. I got up to 5k, over 10 weeks.
I cut back on alcohol, chocolate and cake.
There was one moment, at about 6 or 7 weeks, where the coach said, at the end of the run "you're a runner now", and I started crying.
Post exercise euphoria really was a thing.
Over the winter, due to the cold air being a trigger for my asthma, I had to stop running, but found an exercise class where I could take my child along. The time became available to swim whilst my eldest had her swimming lesson.
I have a Fitbit, and average 15,000 steps a day.
I'm back to running now, running 6 or 7k, three times a week.
On Sunday, I took part in my first ever race. 5k, and the first time I have run with other people since school. Last year, I would only run very, very early in the morning, so people wouldn't see me.
I'm still overweight. I've dropped 3 dress sizes, but still have 20 lb to lose, to be a healthy BMI.
But, I'm fitter, stronger and happier that I've been for most of my adult life.
My eldest child threw her arms around me, last week, and could hold her own hands together around my waist. She said "Mummy, you're shrinking"
I do have stretch marks, and my tummy skin is a bit loose, but I don't care.
I wish you all of the best.