You have said it exactly the way it is. Some people have to sell for some people to buy. We have witnessed a serious downtrend this year. Only within a few days, bitcoin dropped buy about $2000. For some people, it the end of the road while it means the opportunity to make good gains in future for some people.
Obviously! That is the thing about markets, someone has to lose for someone to gain, and there is no two ways about it. It is more like bidding, so it is now left for you as an individual if you want to be the loser or the gainer as time goes on.
The reason why the bigger players can never lose is because they control the market and they have the funds to do so, but in most cases, how you are selling at loss is now dependent on whether you need the bucks to fill up some needs and you have no choice to sell lower than what you bought, or you are busy panicking and selling at loss. The latter are always considered the weak hands due to their level of impatience in the market when it comes to investment.