I had been not drinking any caffeine for a long time, but lately I was getting very tired at work, especially in the afternoons. So lately I have been having about 1 sodas w/ caffeine a day. Sometimes it seems to help a little. Exercise would probably be better though.
I have heard that Welbutrin does not have the sexual side effects.
I agree with west virginia girl, that you should try and get some help with the shyness, because I know from experience that it only gets worse with age.
As far as the girlfriend thing, I have no experience, but I think that there are probably 19 year old girls that also want a boy friend, but do not know exactly what they want and do not want to spend all their time with him.
So you might be able to find someone looking for all you are able to offer at this point in your life. (Which to me sounds very normal

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