My Account Profile was stolen...please Help me!!!

Hey guys,

something very odd happend last night. When I was browsing thru the users that I am following, I recognized one user Hive account@bearbear613 who is having the same profile picture as I am.
I was really shocked to see that, and first I was thinking maybe this is just a display failure. But the picture did not disappear and mr Hive account@bearbear613 is really using my profile picture.

That felt so strange for me, because I never made my picture public and I dont know how he was able to get it. Maybe this guy somehow managed to access my account which really would be the worst case, but how is that possible? I am on steemit now for two weeks and I really dont want anybody else walking around with my head on his shoulders.

So please all of you good steemians...please Help me to solve this Problem.
Does anybody know how he could get a hold of my profile picture?
Does anybody know how I can stop him from using it?

Please resteem this post so I get as much Feedback as possible...Thank you all so much!!!!