Are these sentences ok?
Right now I'm doing something and it's not fhinished yet. If say like this,
I'm doing this for the first time in my life.
I'm doing something like this for the first time in my life.
Are they grammatically ok? Or what would you sa?

Question

Are these sentences ok?
Right now I'm doing something and it's not fhinished yet.  If say like this,
     I'm doing this for the first time in my life.
     I'm doing something like this for the first time in my life.
Are they grammatically ok? Or what would you sa?

Answer

I'm doing this for the first time in my life.
I'm doing something like this for the first time in my life.

The two sentences are fine, but they have nothing to do with your first statement:
"Right now I'm doing something and it's not finished yet."

Answer

The grammar is fine. A more natural way to say it is "I'm doing this for the very first time".