HELP! SOMEONE HACKED MY YOUTUBE?!?

Ok, so I went to go onto my account and I had a message. A girl had replied to a comment I made on a "CQ-London Jam" video? First up, I never made a comment on that video, second I never watched that video? Then I got nevrous and went to check my history seeing other videos I never watched on there?... show more Ok, so I went to go onto my account and I had a message. A girl had replied to a comment I made on a "CQ-London Jam" video? First up, I never made a comment on that video, second I never watched that video? Then I got nevrous and went to check my history seeing other videos I never watched on there? Please help! I'm so worried now that my videos will be sabotoged and they will leave rude comments on other videos! I never shared my password with anyone. I don't log onto my account unless its on my computer or laptop and I always log off, even so no one in my family would be watching these videos and leaving comments? Was I hacked? If so what should I do?!
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