Imba sadness

I feel sad .. suddenly out of no where, i wanna cry hard and keep crying till my tears dry out.
extreme sadness that i can’t explain. i think i’m sick or some freak.
seriously .. that can’t be normal !

SADNESS, I thought a lot about the reasons why I’m always sad and i came up with those:
I have some very big targets in my life and i do not know how to achieve them.
I do not know what i want or what i should be doing.
I do not like my studying area ,although it’s not bad and has a great future, but i just don’t like it.
I completely lost all my old plans for future and can't come up with new stuff.
No female presence, yes that’s right. I don’t have a girlfriend and never had.
why?
simply because I have this thing about not being able to do useless stuff...
stuff that i can see clearly that won’t work due to practical reasons and will cause a huge amount of pain in the end.
Also I think that human emotions are something very dangerous to play with or take lightly.
yet again how do I know that if I’ve never tried ? this also causing me a really bad case of loneliness that I’m unable to escape.
Low self-confidence
My self-confidence is slightly shaken by past experiences and I have no idea how to restore it.
other than those stuff my life is almost perfect, I’ve no BIG BIG problems… nothing
yes … nothing …
Nothing is the problem itself .. a huge pile of nothing in both my heart and mind .