What should I do about this?

I'm an adult (23) but due to financial issues I still live at home. Yes, I have a job but the pay is terrible so I can't afford to get my own place and yes, I'm trying to get a better job but really where I'm at not many opportunities really. That's not the issue nor do I want to get into it.

The problem is my mother is too nosy! If my cell rings and I walk to my room to talk in private, it's like "Who was that on the phone? " Or if I'm doing my thing in my room she'll walk in without knocking pretending she needs something from me or needs to tell me whatever or show me something or say something like "This or that's on tv, thought you'd like it" but really I know she just wants to see what I'm doing. If I'm on my laptop she'll walk around trying to see what's on the screen. I'm just so annoyed by this. Just this morning I had a tiny outburst at her because I was getting ready for work and she goes "Where you on the phone last night, I thought I heard giggles coming from your room, who was it, was it insert name of someone" I was on the phone but I'm so sick of it I just said no, I laugh in my sleep she was like mm are you sure, come on were you on the phone? (It was my cell) so I just snapped. I told her I'm an adult and need my privacy sometimes. Then I went to work.

I'm not a bum either. I help around the house and help cover expenses like cable, rent, food etc. She doesn't want me to move out either (not that I could even if I wanted to).

What should I do about this? I feel like such a little kid and I'm not.
What should I do about this?
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