There is a difference between T and M rated, and if this had been better quality it would have been M or higher and you need to consider this for future reference. When I was 13 I often made this same terrible joke that wasn't funny to anyone but me, and you need to remember this is on the internet FOREVER now and not everyone will look upon this kindly.
I am not trying to put you down or anything, what I want you to realize is you should not make dumb mistakes that live to haunt you like I did.
Overall, the lines were smooth for a first animation, even if the content was bad, and nobody can expect quality voicing in a first animation because recording equipment isn't cheap. Don't stop animating, just consider different content in the future.