I would love to learn how to focus in one damn area of CS, I have been doing some IT Security but it's sooo wide and there are sooo many things to learn and ace

I would love to learn how to focus in one damn area of CS, I have been doing some IT Security but it's sooo wide and there are sooo many things to learn and ace and I don't think I'm Linux /programming /DBA /Networking / robotics savvy at any of these... I'm just confused about how to direct my career... Oh and I'm 35 hehe