I washed my clothes and not they are tighter.
Did you buy them in a loose state, or did they shrink a lot?
I bought them at a loose state. What do you think will happen if they're washed again?
Washing clothes without paying attention to their laundry care tag can lead them to change size or be damaged. You should always be careful to prevent clothes from laundry damage as it is very wasteful if they get ruined.
I will accept responsibility for it since I know it's my fault.
We all make mistakes and you've already learned from yours. From now on your clothes will be a size that fits and you can wash them appropriately.