When I use my browser. There's ads everywhere, even in the google main page.
Your computer (or at least, your browser) is infected with Adware (which I consider to be a special type of Malware).
So, uninstall your browser. Reinstall.
If that doesn't help, maybe some of the more common tools of spy- and adware removal will help, but I'll be honest with you:
I work with computers in all my jobs, and when one system shows such symptoms, it gets flattened, set up anew, and data is very selectively after extensive anti-virus inspection copied over to the new system. Trying to "fix" such systems is never giving you certainty it's not still infected, and I can't (neither for emotional, nor contractional reasons) accept the chance to work on a system that is infected with software that has the purpose of exfiltrating my user data (to show me targeted ads, or worse).