My first time in surf

Well, in my first time in surf I was 12 years old and it was in Zarautz (Basque Country).
I've gone with my family and two other families very friends of us who have already go in holidays together a few times ago. So my brother and I went to a surf shop to lend two surf's tables and, without any monitor, we went onto the sea to surf.
My brother was 16 so he was so many stronger than I and he goes deeper to surf bigger waves.
Then I kept nearly to catch little waves.
A few minutes later I look where my brother was but I couldn't see him so I was very scared. I try to tell it to my father, who was in the beach but I couldn't see him too then I thought that I was lost.
Finally I could see them in the beach searching me but at least 500 meters away where I am then I started to walk through they are and when I arrive there my parents were very angry with me, I didn't think about currents marines!