Need any kind of advice

:sad2: alright.. here goes... any kind of comments/advice would be appreciated...
A bit about me:
studying in london, during the summer and other holidays come to lithuania, staying with parents etc.
Met a girl a few months ago, everything was well, but about 2 weeks ago, i kinda got under tension, dont know why, probably 'cos of some stress.. i am not sure of myself, i mean bedwise.... nothing like this hapenned before, i kinda don't control myself and this gets to me....
basically, the question i am asking here is....
any way to raise self esteem, self control, the way it was before... as soon as we get together, i become tense and all that "i want it now" becomes "i dont"........ tryin not to think about it, but makes me feel bad 'cos i cant :p.......
and the problem is.. i am totally falling for her, if it was just a one night.. wouldnt be a problem..

maybe its just something that goes away with time...

comments plz )) thx beforehand