Can BMX be too small?

I am kinda new at this,I have bought bmx when I was 11, it's a small black bmx and I can say it's pretty small,I stopped using it for years and now I want to start this again but I am much older and I think it's too small?.. I guess,I am a little bit scared to be honest about people's opinion outside about this because I am new,how to say if a bmx it too small for me to use it? And what if it's small but I still can use it,is ut okay or will I be called poser and wierd?