Is this a good sign? I'm learning Spanish!?

I've been learning Spanish for three years and I LOVE it! I plan on doing an exchange program soon and I'm going to take Spanish the rest of highschool and collge. Recently I am constantly thinking in Spanish an it's driving me crazy!! When I think, say, or hear something in English, I self-consciously translate it to Spanish. Sometimes I even start speaking in Spanish instead of English. Haha! Is this a good sign? How can I become fluent eventually??