Hi OP, please forgive my English skill because I am not a native English speaker.
Would you please try to look at this way, when you bought coins you are actually investing into this Bitcoin community. In this community, we have different kind of person: trader, holder, entrepreneur, etc... They all provide different role for this community, trader provide liquidity, holder provide stability and entrepreneur expand this community. When someone else sold coins to you, the capital they got from you may be used to conduct further trading activity or starting a new venture. All these kind of activities make this community more mature and stronger.
In my opinion, the falling price of Bitcoin actually make more people cash out and doing some real world works to make this community even stronger but you need patience to wait and see the result. You have every right to quit from this community, the money you loss is actually a contribution to this community and make it stronger.