Well Im 28 too and live with mum again, now already for 5 years. I can understand how its easier to live with mum when even making 500 a month would leave a person with nothing when living alone after paying rent for a flat that you dont own. Then again buying my own flat is not that simple when prices are doubling every 2 years but salaries are staying the same.
Anyway if I had my own place I wouldnt care if girl lives with her parents or not cause I could just bring her to my place after first date and so on. But when I live with my mum I always been lucky to end up dating girls who have their own place to live. Still even with a girl who lives with her parents there would be a solution to rent one of those flats that you can rent for hours or day. Not cheap in long run but cheaper than hotel.
I think most girls after 25 have or do want kids so they might like better independent guy who have his own place but I dont think a girl would run from a guy who lives with his mum except if she is a gold digger and care only about money. If girl want to date guy then she will. Where is will there is way. All girls who have dumped me have left left me not because I live with my mum. But because I didnt know how to handle girls and did many mistakes.
In the end more important is that you have some interests or passion. You might work in Mcdonalds but be passionate about photography and girls will see - Okay this guy is passionate about something.
Its important to dream about better things and then put all your spare time and means to achieve them.
I remember some 19 year old girl(she was living with her mum too) told me - "girls would like you better if you had your own place." And I told her that Im saving for my own place and she seemed to like that. So yeah its important that you are aiming for something, striving for something, have goals and dreams in your life. Some girls will be able to see your potential and often many couples start from zero and achieve everything together.
Doubt kills more dreams than failure ever will