How does one remove personal information online?

I have been looking myself up on any online browser and I am finding my current address, phone number and private information that I don’t want others to know. I have seen this on voter registration sites and people finders. I was adopted under protective custody and had to change my name when I was young. I am still in fear at times and I don’t feel comfortable with the information that’s there about me being public. It’s too much and it scares me