To be honest if it's not bothering you then maybe it' not a big deal... I think most people act cildish from time to time. Although I know it can be a bit embarassing when/if others notice... Has anyone mentioned it to you at all? Probably easier for those with an outside prespective to see if it's that "abnormal" or whatever. It could be that because you learnt about it in psychology that you are over analysing it.
I may be biased though as I act "childish" a LOT lol
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