Already is known to be a type of word that is used when people complete a task or do something that is earlier than the expected time. For example, you may say, “I have already bought groceries because we are already running out of supplies.”
This means that even though you are not scheduled to buy groceries yet, you have decided to purchase it because you think that this will be more ideal. When you say “yet,” this means that there is a task that you are trying to put off or you have not done for that certain period time. You can use “already” when you are feeling more positive and “yet” when you are feeling more negative.