Supply and demand. That is what is happening. The demand is not eating up the supply, who knows why? No one, you cannot possibly know what's in the head of bitcoin holders.
If you are afraid you can sell your coins. It is always a risk, there no escape from that. But hey, everything is a risk. It boils down to: do you think bitcoins are a good investment or not? No one can figure that out for you. It is your decision.

One thing to keep in mind: the price will not ask you permission to take off. We have seen that movie many times.