I can't have an original idea anymore (idea)

It seems like lately that I frequently come up with an idea that is completely independently reasoned from scratch by me, only to find out that someone else has already thought of it. Sometimes I wish I could live 100 years ago so all of these ideas would be useful (Bah, I know that wouldn't work). Is there a simple term for this situation? Are there support groups? Medication?

Here are some of the ideas that I've already been beaten to:

• Everything's epicenter link for "Random Node not by Webster 1913" (what started me on this node)
• The universe could be a big closed hypersphere
• A solar powered fan to keep blowing the accumulating hot air out of your car when it sits in direct sunlight.
• The possibility of solipsism.. geez, there was even a word for this. I used to think of it as the "put the human in the holodeck and see what he does with his life" possible theory of the world. Sort of like The Matrix
• A washcloth shaped like a glove for washing dishes, the car, etc.
• Running water from your water main to your water heater along the drain pipe from your shower to heat the incoming water.
• Around 1997, after seeing the success of the IMDB and the CDDB, I was conspiring with a friend about putting together a community-contributed encyclopedia on the web. We decided against it when we realized that people would be unlikely to put up accurate content. Everything came to find a solution, as XP seems to work well an a positive incentive for being accurate, or at least entertaining. (I guess I wasn't really beat to this idea since I gave up on it).

Hmm... there have been many more than this. I will add more as I remember them.