Feeling like a child person

Does anyone else ever feel differently, like as in a person? At times I feel like I'm a young girl maybe like 12-13 years old. I guess it's a reaction to anxiety and my way of escaping stressful times? 

When this happens I feel so different. My thoughts change, how I feel changes. In the past I've even spoken to child line which I feel bad about doing.

I'm not sure what to do about this. I've thought of talking to a doctor or therapist but it's a bit awkward. Don't really know how to bring it up and don't want them thinking I've got mental problems.