Am I good enough? Can I do it?

I was asking this question to myself today.

I read somewhere that many of us tend to ask such a question to ourselves atleast once in this life. Mostly when we are presented with a change or when we are seeking new opportunities. I had asked this question to myself today because I doubted I could succeed. May be I am too shy or too old or too young or too some reason I do not know!!

Whatever reason it is...may be it is just an excuse. Probably all I need to do is to take a serious look at my reasons and start believing in myself because I am good enough and I can do it.