When you really understand the blockchain and bitcoin, you have faith in bitcoin, and you will actually hold bitcoin for a long time.
I agree with you, Bitcoins rate may not be stable anytime but, I have a big hope for bitcoin. Many were talking about the lost of bitcoin but I doubt it would happen as long as there are still who believed in bitcoin and blockchain, Bitcoin will last. Its not bad that you worry about bitcoin but don't stress your self for the things that not yet happen. I know and I also read bad news about Bitcoin but I'am not affected anyway because I always think the positive side and the good benefits that bitcoin award me,Lets just hope for the best,lets be optimistic that bitcoin can survive in the next years to come.