It is actually. Everyone wants to get profit from a investment. The price is not so good right now then why sell?
In January 2017, the value of bitcoin was just $900. By mid-December, it hit an all-time high of almost $20,000. It is the nature of bitcoin. So, don't tense about it, stay with it. Besides that, some cryptocurrency experts recommend cashing in a portion of your bitcoin now, especially if you're risk-averse or have pressing financial needs.