Official Score Reports and Self Reporting Scores

Can anybody explain to me what the difference between official score reports and self reporting scores is? I know that official score reports are the scores that are sent through the official website such as the college board website or the ACT website. I am only sending my ACT score and not my SAT scores because I did way better on the ACT and my ACT score meets the requirements for all of my schools while my SAT doesn’t.The Common App has a part called “Testing” and it gives you an option of self reporting scores along with the official score reports. If i choose to self report, then should I put all the tests that I have taken or should I just put the tests that I am officially reporting (ACT)? Will the self reported scores affect my acceptance/admission to the school because some of my scores don’t meet the school’s standards? Please help me as much as you can, my guidance counselor isn’t helping. Thanks soooo much!!!