Learning Trade Forex

I've started to make ugly mistakes. I don't judge myself on mistakes made after first big one because they are reasonable because they are made on heighten emotions. I think that my biggest mistake is trading with too small size (again). So I didn't close my profitable trade and I let it go full length back against me. The thing is that I felt that it just isn't enough profit and I can't do that.
After it I averaged around the same price expecting to get out if it's not working immediately, well I didn't. After I had several occasions to close it in profit or b/e but I wanted bigger profit. Finally I close it in a loss of -12 full size pips. In next minute it fall back so I shorted again, now with full size, pure emotions desperate trade. I lost on that one also -14 pips.
Again, mistakes made on heighten emotions is something that I can't blame myself it's just as it is. But not closing position with 17 pips of profit because it's half size and that is less that 10 full size pips, even if I know that there is support around there is wrong. So I think that I should up my size and trade with full size or not trade at all if I can't stand the size.
-26 full size pips

update

more losses later, -83 full size pips total for a day