I Need Someone to Talk to

I do not know what is happening with me.. Everytime i try to talk about it to my parents.. they just think its nothing.. but it is... i do not want to bother them about this.. i just keep it to myself.. i hurt myself.. i cry..
i dont do it always.. i hang out with friends.. i laugh.. i do all the fun .. but in the end.. im all back to my thoughts.. maybe i think too much.. i feel so down.. i dont know what i need.. i dont know if talking to someone really helps.. i try but.. i just cant keep up the conversation.. i end up boring them.. and when i realize it. i just stop and take it back to myself.. i'm just too tired.. i dont know how long i can carry on like this :(