As a 15 year old you can't just move out. Based on the facts you have provided, it does sound like there is abuse in the house and CPS may need to get involved to work on the situation or remove you and your brother from your parents. They would not necessarily take you to California.
I do not know why your twin brother is in California and you are here but if you have a parent in California it is possible you could return to California to live with your other parent. If there is a possession order issued as part of a divorce that led you to live with your parents here in Texas then your other parent could seek modification of the possession order to obtain custody over you.
It does not sound like this is a good environment for you regardless of whether you go back to California or somewhere else in Texas. If you do not have somebody in California who can take custody of you through appropriate legal channels then I suggest you speak with CPS about your situation.