How to clean this messy home

Hello Reddit! I am in desperate need of your help.

Growing up my house was always messy, and when I say messy I don't mean a dish left on the table, I mean there was no room to eat at the table. I am currently 21 and my house is still like this.

One of the big reasons I feel like my house is like this is because my mother doesn't really do anything to clean the house. It's not like we rely on her to clean up, it's just that she leaves a mess herself.

Another reason my house is like this is because my mother buys an excessive amount of stuff on a daily basis. And when she does buy something it is WAY more than we need. An example of this is when she ordered clear plastic cups online. We rarely ever use them but she ordered 6,000. I'm not even exaggerating, I have 6,000 cups in a box in my hallway. (I feel like she has a shopping addiction)

Another reason my house is like this is because no one tries to clean the house, except for me. I have cleaned for house only for it to go back to the way it was days later. Also when I do clean, my mom goes through the garbage bags to see if I threw out anything she "needs."

I should also mention that no one has come over my house for years, except family on the occasional holiday, and I have never had friends over because of this problem.

This is an overall embarrassing and frustrating situation I have been dealing with throughout my entire life. Does anyone have an advice on how to move forward and eventually get a clean house?

TL;DR My house has been a mess my whole life and I'm looking to fix it once and for all. Some of the reasons it's so messy is because:

1. My mom buys stuff we don't need and doesn't get rid of anything
2. My whole family doesn't do anything to help with this situation How can I fix this?