What freedom means to me

I value my freedom because it's very important for me. I chose schools and a university where I wanted to study. I choose people with whom I want to be friends. No one makes me do what I really don't want to do. For me, freedom is one of the most splendid gifts since our birth.

Very important for me is okay, but to me sounds more natural.
You were correct to say chose and not choose as you are speaking in the past tense.
You were also correct to use with where you did. If you move it to the end then you end the sentence with a preposition, which is bad style up with which you should not put. :) I'm joking about the style but it's fine to put with where you did. To be fair to Kayla I think in American English it may sound more natural with with at the end, but in England "with whom" is preferable.
To use really as an intensifier is a little colloquial, but very natural. It certainly sounds more English than American though. Generally, Europeans learn English but Pacific nations learn American English. My advice is to listen to, and read, both but try to choose one for your own speech.

what freedom means to me

I value my freedom, because it's very important for to me. I choose the schools and universities where I wanted to study. I choose people with whome whom I want ot to be friends with. No one makes me do what I really don't want to do. For me freedom is one of the most splendid gifts I have received gotten since our birth.

Nice work! :) Just watch your tenses. - Kayla