Hi there heyanon, and welcome to Scarleteen!
I'm glad that you were able to have such a nice experience! I can't say for sure whether you orgasmed or not, because each person kind defines that for themself. But I will say that those feelings of hotness, and those feelings of release sound a lot like an orgasm or climax. You can learn more about the difference between those things over at Sexual Response and Orgasm: A User's Guide
That cloudy/white stuff is probably just vaginal fluids that got kind of "churned up" (for lack of a better word) during masturbation.