It's said that 2nd conditional are used to talk about unreal and impossible things but i think it is possible things. Here are some examples of 2nd conditionals :
1.if people complained ,things would change. (Does it mean I'm wishing people to complain in future to get the things changed ? )
2.if i didn't have headache, i would go to the party.
(Does it mean I'm wishing me to be healthy or i have headache now ?)
Things getting chanded and going to the party is possible if the required conditions are fullfilled. But why it's said to be impossible?
I'm confused in their meanings could you please make me clear ?