Is it yesterday, or tomorrow?

I am confused between these two words – yesterday and tomorrow. I’m not sure which stands for present and which stands for past.

For example, my mom always corrects me whenever I tell her these:

- Amma, yesterday you should come and pick me up from school.

- Amma, in the morning, you should give me lunch.

- Amma, tomorrow I ate two toffees.

- Appa, yesterday we will go to park and play football.

Can anyone here help me with this please?