Is it normal to mix up languages?

I grew up speaking Spanish as a kid and then had to learn English, and now I'm mixing them up?? Like, I would be speaking Spanish with my parents and then suddenly I can't think of the word in Spanish so I fill in with an English word and my mom gets upset and always says "Brock, you can't mix... show more I grew up speaking Spanish as a kid and then had to learn English, and now I'm mixing them up?? Like, I would be speaking Spanish with my parents and then suddenly I can't think of the word in Spanish so I fill in with an English word and my mom gets upset and always says "Brock, you can't mix languages!" Am I crazy or is that normal?
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