Today I let another girl slip away from my hands....I looked at her when she was buying pastries and later she walked out of the shop and waited at the bus stop. She seems to have notice me looking at her and somehow she seems to shift herself in my direct line of sight. And all this while, I still couldnt brace up the courage to go talk to her!!!
I was talking to myself...come on man....u can do it. I virtually stood there for like 20mins struggling with myself until her bus came and she boarded it. Felt like kicking myself in the nuts.
I have these kinds of situations in the past whereby the girl seems to come within my proximity or even eyeing me, yet I still cant get enough courage to chat them up. Please, can anyone help me?

Just be a man about it and do it, you'll fail the first few times, as like everything else it's a matter a practice.
And maybe you should start at easier locations, where women expect to be approached, makes it easier for the beginning IMHO.

women will not make your life better

go for balls man! youth is the time for balls not for thinking. when you are old, then you can think.

but, in contrast, I give you brain food to think about. when you are old... would you rather say to yourself, I got shot down but I had balls, or, I wish I had balls.

The longer you think about approaching the harder it is going to get. Just do it before you have a chance to think about it.