When I grow up I want to be a scientist.
When I grow up, I want to be a scientist.

Because I like to invent things.
Because, I like to invent things.

I want invent robots.
I want to invent robots.

Because if we have robots they will do some work.
Because, if we have robots they will do some work.

I even do a science fair in my school and I got first place.
I even joined a Science fair in my school and I got first place.

My title is fruit battery.

I like to do many things about science.
I like to do many things about Science.

Hi, Aiden!
Thank you for sharing about what you want to be when you grow up.
Please be remindful of the following:

-comma usage
-capitalization of the some words
-preposition