stop overthinking, (I think)

I’m really analytical and tend to over think things.

Sometimes I feel like I am reflecting too much, and trying to find a meaning or to discover new meanings every day. It happens when I have nothing to do.
The facts I think about are not particular people or events, they’re just me, who I am, what’s the meaning of life.. is it right to be spontaneous and to be myself (including my bad habits) or is it right to change?
Every day I think about this and I think that my main need is to be calm, relaxed, focus on important things and I cant find all of a sudden a meaning of life.
It’s impossible; but it is also a positive thing that every day I learn something new from myself.

But I also think it’s a waste of time and energy from my study, and that I should just relax when I am not studying cause overthinking absorbes my energy.