If everything is dropping, it's typically normal market movement. They tend to rebound in unison after a while, too. It looks like Bitcoin has hit a record low, but you honestly shouldn't worry about it. Things like this happen all the time. It may seem daunting if you're new to crypto, but at some point you'll just learn to dismiss it. The sooner you can do that, the better.

Meanwhile, here's an article that tries to explain why the market isn't doing too well right now:

https://finance.yahoo.com/news/apos-why-bitcoin-ethereum-ripple-202800064.html

Emphasis on tries, because no one really knows for sure why the market moves the way it does. If it truly is caused by the Bitfinex issue, then we may be stuck in a rut for a while. This whole issue about Tethers was just a disaster waiting to happen from the start.