Welcome to TE!
Don't worry, you'll get there. I'm impressed that you're cycling again after 2 years of serious illness. Your body is healing and it will take time, so just enjoy the progress of your body getting on the bike and take it easy on yourself.

I know we like to see progress fast, but be patient with yourself. If you can find a buddy, that would be wonderful for companionship and accountability, but if not- just enjoy those miles on your own.