Although... I AM able to find out whether you're happy or sad so don't try and hide that from me. Why do you try to hide such feelings from a person who knows you all too well? It's not that there's other people around... But if we are such close friends, you would spare me the agony of trying to get you to tell me about your problems. If you say "Nothing's wrong", I may just simply say "OK." but I will forever think about it unless you're willing to say "I don't want to talk about it now" or "I'll tell you later." Saying so will at least let me know that you are not hiding anything in the sense that you have no problems and it makes me feel trusted and it also lets me know that you think of me more than just an everyday friend.
It's funny. People always ALWAYS hide their negative emotions around others and they never end up getting help. Sharing with someone you know and trust can help you feel better as well as letting them know that you are indeed trusting them with your problems. Maybe you should tell someone you trust, even if you don't want to receive help. You can always tell them that you don't want to receive help, that you just want to share. This would be because even though you're not receiving help, you feel better just sharing with someone else.
NB: Me saying "I'll be there for you..." only applies if I know you and are my close friend.