I feel Fat, Fat, Fat

Hmmm, I know to people at the gym I look slim and to my friends I look slim, but its not all about how you look in clothes.  I certainly do not look good in a bikini and I am really unhappy with the way I look.  It seems no matter how hard I train or how well I eat it just doesn't happen, I then when I do eat really well somehow I end up sneaking in some ice-cream or having a glass of wine and I am not talking huge amounts but just here and there, and I have just reached a point where I just don't know what to do anymore, do I train more, train less, I am so confused now about what to eat and its just getting worse.  I don't know what works for my body at all!