Welcome to the world of being a runner hanna
I started running 5 years ago, like yourself i just looked at myself one day and realised how fat and unfit i was. I weighed 18stone and would be puffing and panting just getting up from the settee or walking up the stairs, i also suffered from depression and anxiety and it just dawned on me how pitiful and pathetic i had become.
I still dont know why i chose running or what exacly was the trigger to go out one day but i waited til it was dark, i put on my baggiest clothes and went out and ran just over a mile ! It nearly killed me and i had to walk home as i was in such a state, took me nearly 2 hours before i got home !
2 days later i went out again and ran the same mile and turned and ran 400-500 metres of the return before walking, a few days later i ran a little further. Roll on 5 years and im over 6 stone lighter, i run 4-5 times a week, i race, i do cycling sportives and i run for my local club.
You've made a start and that is the hardest part, keep coming on here to update us
With how you are getting on amd well done !