In which language shall I speak to my brain?

Hello all!
So, my mother tongue is Spanish and in fact learned English almost at 20. I live in an English speaking country. My question is should I be making my models in both languages? Some of my thoughts were stablished during childhood, therefore in Spanish, some others later on in life, ergo in English. I wonder if my brain creates a neural pathway in Spanish and one in English for the same believe if I practice the thought in both languages indistinctively? Thanks, Lina