I'll be 20 soon but I'm really a kid at heart, is this normal?

I'll be 20 in a few weeks, not looking forward to it. I do not feel 20 and infantile act myself when I'm with friends, I also like to watch SpongeBob and when I watch, I like to play hide and seek with children. There is nothing attractive to me about adulthood, I do not feel there is something in adulthood that I look forward to. Is this normal? Or what should I do? Most of my friends have matured, but I'm still the same old me. I am a girl by the way-_-

absolutely

Spongebob- Not Normal (Speedy)

Not Normal/Gone $1.99 …