Hi,
@yael, and welcome to the forum,
I’m assuming this will be your first camino, and if so, lucky lucky you! We frequently have posts like this from those who may be slightly hesitant about walking alone, and you might connect with someone here who has similar plans and starting dates.
But I think the accumulated wisdom here on the forum is two-fold.
First, you are going to be walking during a high-traffic time from SJPP and there will be many others starting out when you do. Many of them will also be alone, and you are very likely to meet a congenial group.
Second, starting out with just some random stranger might be a good idea for companionship during those first hours of uncertainty and nerves, but I think most of us would say that it is unlikely that you will make a connection here with someone who will be compatible with you — not just in terms of personality, but maybe more importantly in terms of walking speeds and styles.
My unsolicited advice would be not to worry if you arrive in SJPP and don’t know anyone. Start to walk, and you will meet others very quickly.
Buen camino, Laurie