Someone must buy it before you can throw it out. But your worry is totally unnecessary. Countless people play in the futures market, each with his own ideas. If you buy at the back, you will feel that the front has risen so much, it is easy to make money, and you are desperately rushing in. What you bought in front of you may also feel that you have earned enough and will throw it away. It is also possible that people still want to make money after making money, and they have to add positions. Various considerations cooperate with each other, and generally your worries will not appear. So you don't have to worry about this at all.

Unless there is an extreme market, such as the opening limit or the limit, the transaction may not be possible. Or you are a super-large, the market can't fully digest your positions, and some positions may not be closed.