Ok, picture this
You are sitting around your house minding your own business when something 50 times your size traps you, plucks you out and places you in a mysterious clear container. There are no hiding places and no where to escape to, then it gets dark. It seems to be getting cold as well. What happening? Am I going to die?
After what seems like an eternity and a heck of a lot of shaking around, it gets light again and the container holding you gets dumped in a total strangers house where everybody knows each other. They seem totally comfortable in their environment and didn't ask for anyone else to come round.
When your container gets opened and you are let in the house, you realise that the conditions are different to what you are accustomed to. It's hard to breathe at first and none of the people in the house want to talk to you. They eat food but it's not food like you have been used to and initially takes a while to get used to.
It may take a few days for you to act your natural self in these circumstances, so don't worry too much.
Some fish do settle in relatively quickly, but it's normally the ones at the bottom of the food chain or eternally hungry ones who do so.