Split personality normal?

Everyone may have some type of OCD or ADD. So I was wondering if having a split personality or an alternate personality is something that many people can have without knowing. I don't really know how to explain it but there's this situation where I don't feel like myself. Like I'm sweetest and passive and calm by nature. But then I'll turn into this mean, vindictive evil somebody. I haven't harmed anyone, but the thoughts are just so cruel. Idk maybe I'm crazy. Now that I've typed this out I feel like I'm crazy but I just wanted to know if I should be getting some assistance or if this just a weird girl thing. I appreciate the support in advance. 🤗

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