Do you think it is childish to be 20 and have a hello kitty obsession?

I just turned 20 and for my birthday i asked my boyfriend to get me hello kitty stuff. Of course he did get me what I wanted. A hello kitty jewelery box, pillow cases, ea ring and gigantic hello kitty balloons. Now that I see all the stuff in my room, I can't help but to feel childish for having all that stuff when i'm 20. I just redid my room this year and it went from a lilac "come play with me i'm still a little girl" to a nice adult blue room. Even my friends complimented me for finally having a more adult room. I want to have an adult room, but still want to show my love and obsession for hello kitty, lol. Any suggestions? Should i just give up this childish obsession?