You’re welcome. I don’t agree with some of the religious or explanatory aspects of Buddhism, either (e.g., reincarnation, karma). Otherwise, I’d still be practicing. Nevertheless, I still feel that its precepts offers the best guidelines for seeking happiness and for morality as well.
End of hijack.
I remember that being the impression I got after hearing the obligatory 45-minute lesson about Buddhism in high school. But there’s nothing you hear in high school that a little education can’t fix. 
It’s not suffering in that sense, it means “to undergo” or “to endure.” Meaning that you’re kind of at the mercy of your desires when you want impermanent things to continue (hence the “impermanence of pleasure” part). Like you said, “The cause of suffering is a desire to have and control things” which you can’t really control.