I think my alternator is messed up b/c today I drove my car and my cd player kept turning off and my car shut off and keeps killing my battery, I think it's my alternator, I think, can anyone help?

 

does the battery light turn on on the dash? hook up a volt meter to it and see wheres the problem. start off cheap first it can prolly be a dead battery that isnt keeping charge do the test and you'll find out weather its the alternator or battery.