Some people form an emotional addiction to a substance long before they form a physical one, from what you have said, it sounds like you could easily form this kind of addiction, basically because you are using it as a social crutch,not just as a mood enhancer as such.
Thats something you will have to work out on your own, but I don't believe that taking drugs is a good way to boost your confidence and morale as a long term solution.
As for coke being like meth?
IMHO I don't think it is, but other ppl may disagree.
I did live in the UK for 18 months and had some very decent quality, but have been bitterly disappointed at anything that has been offered to me here.
It will boost your confidence, make you feel god damn fantastic, turn your face and jaw numb.....and be all over in about an hour.
I think its fun if you can afford it, but also highly over rated.