What did Siddhartha really meant by ending suffering

I constantly hear from buddhists that "happiness is inside of you" and that thinking you can get away from suffering by wanting to be somewhere else, or wanting to be with someone else or stuff like that, stuff that comes from the outside, is only misleading and will generate more suffering because once you satisfy some particular need, since you are a human being, other needs will arrive and with that new forms of suffering, but then I wonder, how is it possible to end suffering if we will always desire for certain things, as long as we exist in this material world? Can someone clarify this to me? I'm really naive into buddhism