Am i losing myself in life?

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The one problem am lacking is that i loose my confidence when am just near the goal and fall far from it, do this happens to you. Every time i put my mind into it and put my dedication towards something i wish so much to do, my mind puts me in trouble that am not capable of doing such things and end up as a failure, i had only few success so far, am i really in trouble, i dont think , am a sore looser at times and i loose my interest in things and end up failed for things i know, if i go on like this i dont think i can get a job at all, my mind goes blank that i know nothing of my professionalism in what i study and also to think that i dont want to be a burden to my parents all this confuses me. is this a motivation problem or am i the only one suffering from this "can do but cant"? only a few can understand my problem those who can please help me on this.