Not good enough

There are times in my life I feel i am not good enough.
I often ask myself why do I not have those nice long legs? Why do I not have sharp features? Why am I not clever or well endowed since I do not have either legs or smoldering hot looks?
When questions like these come up I feel a point of low, a lack of self confidence and esteem. I feel inadequate in society and right now I feel tired trying to keep up with maintaining my body and my looks.
Today a colleague said I am looking "shag". I mean it is the end of the day but he went on to say I am looking more shag than ever. It is only the start of the week. Shouldn't I look refreshed?
Where did all my energy and youth go?