Tonight i thought “isn’t this a dream, yeah, it must be, 'cos the air won’t just disappear when too many people breathe”
so i understood that i was dreaming, but i don’t think i was lucid, can someone explain more about the border between lucidity and just dreams? or maybe link to somewhere, thanks a lot 
Sounds to me like you’ve had an LD but with low level of lucidity.
That happens to me often. A good way to increase lucidity is to rub your hands, or sometimes I just like to focus on my hands and that keeps me “awake” in my dream, else I just slip back to an ND…
What works best for me is yelling “Increase lucidity 100%!” But like Flanker said, it just seems to be a low level LD. I’ve had a few of those and it can be a bit frustrating in the morning, but don’t worry about it. Its the beginning to having higher level LDs. 
Slinger
You’re considered as “lucid” as soon as you know you are dreaming.
You probably had a low-level LD with poor control or something, that stuff happens.
Now, we could talk about the border between a low-level LD and a high-level LD. I guess this barrier is mostly broken through practicing, but you will probably continue having those low-level LDs after. Try to yell something like “INCREASE LUCIDITY x1000!!” or something like that, sometimes it helps getting better awareness in a dream.
Good luck.