hey Colleen welcome to TE why would we flame you for buying a bike?
Most of us didn't start with fancy custom bikes; a lot of us will never buy one.
(I got to touch one once!)
If you have serious problems, you should consult with your doctor.
Ride places where you have lots of room and no cars to start with. A school playground when the kids are not there is a good choice. go slow take your time.
mimi