We all brew for our own reasons, but I think it's really weird that you are complaining about a lack of a hangover. Is that what you were trying to brew? A hangover?
Homebrew rarely gives you a hangover, even if you DO overindulge. Countless threads are already around that discuss this phenomenon and there really isn't much to be said about it that hasn't already been said. Anyway, if you really want a hangover, I recommend using a very highly-attenuating yeast at an elevated temperature, this ought to produce more fusel alcohols and phenols and other nasty things that should give you the headache you are looking for. It will also speed up the fermentation. In addition, I suggest filtering your beer. Yeast is a natural source of Vitamin B, known to cure most symptoms of a hangover. So filtering, higher attenuation, and higher temperatures should generally help you to achieve the superior hangover you are seeking.
Secondly, the alcohol intake through homebrew can be deceptive due to the greater degree of flavor that is present. Homebrews, especially middle-of-the-road ones like a brown ale, tend to be exceptionally smooth and flavorful relative to the commercial versions. This is due both to the use of more ingredients (oftentimes) and the lack of pasteurization or filtering (most of the time). I never feel quite as drunk off of homebrews... that is, until I try to do something like go for a walk.... errr.. a stumble. If I just sit on my butt, it's just a really mellow light buzz. It's definitely deceptive. Othertimes though, it goes the other way, and I can have a really flavorful beer that people SWEAR must be really strong, when it's really only around 4 or 5% ABV.
Anyway, I assume you are doing extract? If you post the recipe with quantities and how much beer you wound up with (5 gallons even? Or a little more or a little less?), pretty much anybody here will be able to calculate your alcohol content.
But regardless, if it started as wort and now it tastes like beer, you can be assured, the alcohol was present.