I take this song as somebody who is finally getting over a harsh breakup. Saying "im already gone" means he is over her or it and "im already something to someone that I don't know" is supposed to mean that his real true love is still out there and he can finally come to grips that it wasn't the girl that just broke up with him. "Cant live my life in yesterday" means he cant keep dwelling on the past relationships that didnt work and he needs to keep searching for the one who is meant for him. "Im not the type for life alone I need someone" also shows how he needs to have someone important in his life and he will keep searching for that perfect girl.
I take this song as somebody who is finally getting over a harsh breakup. Saying "im already gone" means he is over her or it and "im already something to someone that I don't know" is supposed to mean that his real true love is still out there and he can finally come to grips that it wasn't the girl that just broke up with him. "Cant live my life in yesterday" means he cant keep dwelling on the past relationships that didnt work and he needs to keep searching for the one who is meant for him. "Im not the type for life alone I need someone" also shows how he needs to have someone important in his life and he will keep searching for that perfect girl.