My boomer aunt told me to just invest in the stock market.

I make $62,000 a year.
Take home: $3,900 a month.
Rent: $1,800
Car: $380
Insurance: $260
Groceries: $550
Student loan: $350
Utilities: $180
That’s $3,520 gone.
I have $380 left.
She said “just put $500 a month in an index fund.”
I said “from where.”
She said “cut back on unnecessary spending.”
I don’t have unnecessary spending.
I have a budget with no room in it.
She started investing in 1989 on a single income with a paid off car and a $450 mortgage.
Then looked me dead in the eye and told me I need better financial discipline.
$380 left at the end of the month and she wants to know why I’m not building wealth.