In driver's ed they also told me that since they're smaller and drivers are used to looking for cars, drivers often don't see/notice motorcycles. There's nothing you can do about the fact that other drivers suck.
The real issue is that even if you only get in as many accidents on your motorcycle as you would have in your car (which is probably nonzero, even if you're a great driver--other drivers suck, remember), each one is way more likely to kill you or cause serious injury when you're not surrounded by a ton of steel.
The visibility problem is one of the first things they mention in any safety training. You definitely don't belong on a motorcycle if you don't understand that & don't have the skills to deal -- it's not for everyone.