I sympathize, but at age 13 and with no money, the best thing you can do is experiment with the mic and/or camera that's probably already built into your computer. I don't mean to be harsh...that's actually a pretty realistic way to get started. And if you don't have either of those...now you know what to save up for or ask for for Christmas/birthday/whatever.
There is lots of free software out there (actually free, not warez...do they still use that term anymore?). Download it and play around. Accept the fact that you're not going to get studio sound or vid quality and do the best you can with what you have.
If you stick with it, by the time you outgrow your gear, you'll know what your direction is and have a better chance of affording what you need. Keep in mind that Julia Nunes has millions of hits on YouTube with little more than a webcam, a cheap mic, and a sense of fun. Performance is...well, not everything maybe...but a lot.