My daughter is too clingy and i hate it

So I’m a mum of two kids. My daughter is 19 and my son is 16. I work a 9-5 and the only days I get a break is weekends so I usually like to go out and run my errands on my own without the company of others.

Nearly every weekend when I’m getting ready to run errands (food shopping, browsing sores and so on) my eldest always asks if she can come with me. She doesn’t have many friends at all and doesn’t have a job yet due to her illnesses so she mostly just stays at home by herself keeping the house clean and doing the laundry. I always tell her no because I just want to be on my own while I do my tasks. I don’t get a break in the week and I just don’t want her company when I’m doing things.

She always takes is personally and gets upset because in her words “you work all the time and we never do anything together anymore” I don’t mean to upset her I just don’t want my child around me constantly. I was never like this when I was her age. If anything I was the opposite I wanted to be on my own all the time and loved it when my mum went out on her own. For some reason she’s not the same and she wants to be with me all the time and I just can’t stand it. Am I wrong for this? Sometimes I feel guilty but I just don’t want my life to be all about my kids I want my own life too.