Problem with sites (blacklist or attack)

Hey, i dont know if i should write it here but i need try. So i cant use some sites i think my ip got blacklisted or someone is attacking me so im writing to you for help. When i want go on any site i need do captcha or on other sites i cant even go in. I dont know what is the issue but i need repair it. I scaned my pc for viruses but its clear. When i change from my orginal ip to vpn all sites work so its why im thinking i got blacklisted or im under attack. How i can fix it ? Or should i contact with my internet operator and ask them to check it if yes what i should tell them. Thanks for help.

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