Two Wheels, Too Many, Too Few

I mentioned before why I don’t own a car;
It’s hardly the only way one can go far.
Perhaps you thought, “How about riding a bike?
It still gives you exercise, just as you like.
It doesn’t cost much as a basic machine.
It doesn’t use gas, and it’s very much green.”
For sure, I’ve considered the prospect for me,
But I can come up with a problem or three.
For starters, I gave up on bikes in first grade,
With training wheels on (I was just that afraid).
At this point, I don’t fear the pain from a fall
But can’t say I won’t feel embarrassed at all.
I’ve also discovered that people resent
The bicyclists riding upon the cement,
Yet those in the streets face a worse disrespect.
The way people drive, it’s not hard to get wrecked.
And finally, once you come down from your wheels,
You ought to take caution so nobody steals,
But nothing you do guarantees that a thief
Or a vandal won’t leave you sans ride and in grief.
It’s possible none of these faults is too bad
To sample advantages yet to be had,
But knowing myself, I don’t have enough trust:
A bike in my hands wouldn’t take long to rust.