Well, I use to ride my bike to wherever I wanted to go. That might work for you too. Otherwise, putting on a good pair of walking type gym shoes, is a great alternative to biking. Take long walks / hikes, and see what you can discover. Not having a driver's license is no excuse for not getting out of the house, or becoming a couch potato. Get out and enjoy life while you can before time and old age steal even that ability from you.
Remember, "You lose what you don't use." So, get out there and take life on. You get out of life what you put into it. You decide, what you want, and only you can go out there and get it. I wish you well as you move forward and upward.
Don't underestimate yourself, "Use what you have and never be satisfied with standing still."