what do i do when my iphone 4 wont stop loading?(it has a black screen and a little circle moving around)?

i don’t remember what i did but now my iPhone is black and there’s a little white circle moving around in the middle.i tried shutting it down and pressing the home button but its not working.i also tried charging it, that didn’t work either. when i connected it to a computer nothing happened. i logged on to icloud it said that and it couldn’t locate the iphone i tried sending out some messages but nothing happened :(
this is really important please help :( ( i don’t know what to do this has been going on for more then 20 minutes now

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