Happy or Sad ??

I'm always look happy :D Happy is good, that why i always put smile on my face and laugh often. Happy people won't have so much worries and tense ! A happy person make the world look more beautiful :DD So do laugh and smile often kays ? But but but.. i dunno why these few day.. sometimes i will feel sad and wanted to cry. I don't why and just wanted to cry for no reason ! However, it only happened when i am alone. This is because when i'm with bunch of friends i won't think that much but when i'm alone i will think TOO much ! Only these few day larr.. i'm not always feel this way.. Haiya, i just dunno why... Did i need to find psychology ? haahha ! Or someone be my psychology but i dunno what to tell bcause i already said that i dunno why i feel THIS WAY ! No worries.. as i said it only happen when i'm