Is this haram despite these restrictions

So I have a girl that I met we are both Muslim teenagers and we have never touched or flirted all of that but our parents don’t know about this that I have a relationship with her and I intend to marry her in the future is it haram according to the Sunni if I don’t tell my parents until the right time or do they must know now but I intend in letting them know in the future and until then I have kept the conversation between me and this person for only knowing each other further