" I sat in the darkness with tears in my eyes. Nothing make sense, no matter how I try .. I always fail."
Yes! That's you. You have a goal in life, you want to reach it. Sometimes everything goes alright, but other times just go wrong. you are totally down, depressed and you think that you are never going to do it. At those moments you think that you are not meant for this thing, you look for another thing that you can do, but you always end up at the same place. Some people actually start to think that they are useless and there is nothing they can do... They are only depressed.
It is because they are afraid, some are afraid of failing, others are afraid that they might lose the thing they love, some are afraid to know that they might be not that good and it is not their thing. They make their fear guide them, it controls them. But have they thought about making their fear their guide. Just take your fear your guide and make it lead you to who do you want to be and what do you want to do. Try to make your fear positive, afraid of something do it. Don't give up to your fears, if Albert Einstein gave up thinking that he is stupid as his teachers said , no one would have known who Albert Einstein is. Remember that to succeed you have to fail just like a toddler who falls more than million times to know how to walk. Challenge yourself , setup your goal and know that you are here to achieve it. You still have the opportunity to stand up again, go fight for who you want to be before it is too late. Stop being afraid and start living instead.