I remember that feeling. I used to get in from the c25k runs, sit down in a heap and could hardly stand up again. That was only 10 month ago and now I can run 10k in under 50 mins. Keep it up, you will be amazed how quickly your fitness improves.
Early days but I've got davidsmithrunner for inspiration( instagram). Went to school with this guy who ran from Bournemouth to Glasgow in 3 weeks averaging 30 miles a day He was not fit when he started. Distance not speed. And he's a year older than me !
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