Why does my refresh rate hold my fps back

[Microsoft Windows]

I have a 4060Ti and im trying to play games like minecraft and fortnite but when i do my fps is set to whatever my refresh rate is. so when i set my refresh rate to 120HZ and go into fortnite i can only get 120Fps and when i set my refresh rate to 144 i can only get 144fps. i dont know why this is i have frinds with 60hz monitors and they get like 220fps

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