My grandparents gave me a deal and want to see if I can handle the house myself when their our, if not stay with a relative.

So my grandparents finally gave in and said that they’ll give me a chance to stay at the house by myself. They said that if the house doesn’t look good and if I’m having some trouble by the end of the week I need to call someone and stay with them until they come back but if I can handle it and keep it up well that I can stay by myself. I wanted to prove them that I can do it and I’m an adult. I may be autistic and have meltdowns but how my supposed to learn how to keep up my house when I live on my own and my grandparents never let me try. They told me some relatives (dads side) are gonna go check up on me. Fine by me. I’m 19 going on 20, not 10. They told me if I want to stay with my auntie (my dads older sister) if I want, call her up so I won’t be so lonely and she LOVES my company since I’m her favorite niece and very special to her. She always worries about me when I’m alone at the house. I told her I’ll be fine. My grandparents said I better not burn down the house and don’t be so lonesome and at least go spend time with someone or stay over for a couple days.
They just left for their two week trip and they will be back July 23rd.
Family too overprotective I think it’s because I’m autistic.