I would certainly feel scared if I was stuck feeling like a child when I didn’t want to feel that way any more. I’m really sorry you feel that way.
Please understand nobody can make you express your personality any particular way. While Caregivers may encourage a person to feel more comfortable expressing their regressive interests and desires more openly they cannot make a person become a Little or express themselves in a way they don’t want. Caregivers don’t make Littles little.
It really sounds like you may be actually experiencing a mental disorder. Multiple personalities is not the same as being a Little, even though that disorder often has child alters. Those child alters are not references of being in littlespace or regressed though, and do not truly identify as Littles. For example, a Little cannot become “stuck” in a regressed state because it isn’t a mental disorder, defect, or impairment. A Little never loses or forgets their maturity, knowledge, or capabilities as a functional adult.
So, please find a licensed therapist to help you. We want you to be well. Nobody but a person with a degree in psychology can help you with this sort of ailment. There is good, solid help out there and you deserve to get well so please give a call to your local mental health facility to get you set up with a professional.