The first language acquisition process is very different from second language acquisition - it seems like the brain actually changes around the age of six. Children who for some reason haven't been able to learn a language before that age will never learn any language properly, so learning a second language like you learned your first is not a viable option, sorry. Immersion is always a good idea though, but with your approach of listening to Spanish you will get no feedback to your own attempts, and feedback is an important part of any learning. You know how parents talk with their little kids? Questions and answers, back and forth. This helps the children make the words "click".
Anyways, if you want to read up on the very interesting subject of first language acquisition, the famous Noam Chomsky is a good start. (Actually, I've never read any Chomsky myself, but everyone and their aunt is referring to him, so he must be quite something.)
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