I avoid talking to or hanging out alone with girls (especially girls that I like or am simply attracted to) because:

I feel awkward.
Although I may think of the most romantic/sweet things to say or do for girls I like, I am simply too shy to actually say/do them.
I feel that I do not deserve a relationship.
I see other men as "better options" for them.
I'm not used to having a "close" relationship with anyone. (Parents, siblings, friends.... There's always a disconnect on my end)

There ya go... That's a little secret I've been thinking about recently.