Need to remove the admin

Hi, 

Previously this was my personal account & my client used to send me the information for there files. One of my client - sent me an invitation request - to be the admin of my account & creating me the enterprise user. I actually accepted the request without reading it. I'm afraid if my other client information will be shared with this client. So, I want it to be my personal account & remove the admin status. Please help!

Thank You.