Why does the 'I' thought get lost?

I was wondering: Sri Ramana says that in every thought there is the 'I' thought, so, how can we know if it is there and why does is get hidden?

Initially, I dismissed it as something trivial and instead thought it is good to find the 'I' instead of thinking as to why it is lost. Then, while speaking with Bhatta, I got an answer.

Every thought that comes is about something, or someone and when it occurs, the only thing I know is about what is being thought. So, I become that something or someone and in the process, have lost myself.

So, If I can just BE and not BECOME, what else is needed?
Jai Sri Ramana!!!