How do you actually know if you’re beating the S&P 500 when you deposit money every month?

I've been dealing with a tracking issue for a while and wanted to see how others handle it I deposit money into my portfolio every month. Because of that, whenever I try to look at my performance over 6 months or a year to see if I'm beating the S&P 500, I can never actually tell. Since a chunk of my cash was only added mid-year, that newer money has had way less time to grow, which makes my broker's return percentage look diluted even when my stock/ETF picks are doing fine A few months ago,

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