Can never get anything done

It have been weeks since i worked, most likely i should already know what to do, get it done well & so that everything will run smoothly, but somehow i'm always screwing things up & make a mess out of everything. Being an intern i can never help much in admin work which i should, & everytime i'm given a job somehow i don't know why things will screw up & also i can never handle it well. I always shoot out something which i shouldn't & make people angry, sometimes i really hate myself so much that i feel like slapping myself in the face, nothing bloody nothing in the world i can do right staff deployment i'm too slow, distribution i can screw up the number of audio gudies, staff not cooprtative ticketing i can have problems & almost everywhere i go, something wrong will always happened.

Felt so screwd up not only at work, but also my family life, always having money issues which will in turn argue with my mum, & sometimes it affect my mood & will in turn screw up my work, which i don't want to but what can i do? I never want to argue with her at all? It's just i can't seems to do what she's pleased & i have my own way to do things which she doesn't like. No matter how much i try my best things will still screw up, & seriously can't take it anymore am i such a failure in life? I'm only 18 i should be good at most of the things i do, not so screwed up at everything right?? Same goes for my relationship is like i have nothing to say just one word: SUCK & is ttm. Looking at him i don't know what to do, i failed in so much things in life, when i'm only 18 seriously how the fuck am i gonna continue my entire life, when i still have so much more road to continue walking? Will i fail for my entire life? I don't want to you know? Maybe i should seriously consider what & how am i gonna continue my life journey...