When I was first starting to run, I thought I would never get very far.
I was a very unfit teenager, and basically the only exercise I ever got was walking to the fridge. I felt like I was having an asthma attack when I tried to run, and on top of that my shins would start to ache. Then the rest of me would ache and I'd just give up.
In the end I worked out the best way of starting into running if you've never done it before and you are chronically unfit.
Start out by running for 30 seconds.
That's it. Just run for 30 seconds and you're done. Well, then walk for ten minutes and do 30 seconds again. Maybe do this four times.
A few days after you start doing that, switch it up to a minute. And gradually increase from there.
Don't let anyone make you feel bad about it, because there are no rules about this. You are doing something about your fitness which is more than a lot of people do. So, feel good about it.