Hello,
In my opinion, you are enough old to walk the Camino but not alone.
So,
Your body, at your age, phisically can support something as hard as the Camino. Because the Camino is hard.
When it's sunny, when it's neither cold nor warm, when you have any albergue so close, when you have food and you are not completely tired ... OK. But in a whole Camino problems appear and can be very difficult for an adult person. In this moments you will need any person very close to you, someone who at this momento is ONLY thinking of you and your problems.
You will have to decide what to eat. Who much to spend. To clean your clothes. To protect yourself from sun or rain. To not lose any important clothes in any albergue. Where to stop. To decide what to do always. What to do with an ampolla. If you have a medical problem. ¿Do you speak spanish?
Too much, in my opinion, for you, if you are only 13.
So, if you go with any person older than you ¿may be over 18?, much better.
I've never seen on the Camino anybody walking alone under 18.
Please, I'm not telling you what you have to do, it's just my opinion, who decide are you and your parents, of course.
Anyway,
Buen Camino,
Javier Martin