I think you shouldn't be worried because bitcoin is going dowm this few months, also remember that this has occurred in the past if you chect history of bitcoin and other cryptos.
However, learning the basic factors or reason of the fall in price will also reduce some thoughts like, supply and demand. Others reasons are ,
Increase Merchants Acceptance:
At the moment of doing this post; Bitcoin is now accepted by over 100 thousand merchant. As a matter of fact, bitcoin is gaining more acceptance that Paypal as it is not accepted on eBay, Amazon, Alibaba and the likes. This also have a way of affecting the price of Bitcoin. No wonder some people believes Bitcoin price will greatly increase next year.
Mining:
The cost to mine new Bitcoins affects the price. The cost of mining depends on: electricity, hardware, and maintenance. Miners calculate these costs and sell their Bitcoin for a premium to be profitable. A miner won’t sell his Bitcoin for less that the production cost unless they are running low on cash. New coins only enter the system through mining. Mining generates new coins as an incentive for proof of work. This process generates new coins at a fixed rate. The number of bitcoins in circulation at any time is calculable.etc
Again, these are few coin i think you can invest for future earnings
Litecoin, monero, ripple, etc