To make life meaningful and purposeful, one has to be conscious of the fact that one has a duty, a purpose to perform before bidding adieu. If one forgets that and passes away, a precious lifetime goes waste. It is not that one willingly and consciously does that; one simply fails to be aware of one's duties because of the veil of ignorance and ego one gets enveloped with.
At times, one feels at the depth of one's low; but that is quite normal. Everyone has to go through such 'falls'. The only difference is that the winner realises it is just a phase and one can always rise again.
And there are times when one gets scared because of perceived difficulties. In such cases too, one has to remember that given the right attitude and method, there is always a way to tackle it.
There is a beautiful story in this regard in Paramhansa Yogananda's An Autobiography of a Yogi. He describes a vision he had of standing in a dusty market place, hugely crowded with people haggling over goods. People would go past him and look back at him (he thought). And then a look of inexpressible yearning would come over their faces before they would exclaim, Oh, this is too high!
Yogananda too looked back and saw a huge but beautiful mountain. His first thought too was, "It is too high", but he soon realised that he could at least put one foot in front of the other to begin with. That would take him surely a step closer to the top.
Nothing in life is too high or too big to be scared of. If one finds it difficult, one can always believe in the trusted and tested way of taking "baby steps". This will help one reach one's goal steadily but surely. Do what you can at ease at a time and repeat the process; a time will come when you would get a surprise at your amazing feat!