'connecting my ipv4 address to a Hostinger domain

I have an old computer that I wanted to make a host on it but when I tried connecting my IP address to the domain as an A record but I discovered that I cant I have two ipv4's one is my private one that can be reveled when I type "ipconfig" in CMD and one reveled when I type " what's my IP" in google and whenever I link it the IP works good as a link but putting the domain wont work please help me this is my first try to host a website from a localhost



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