Am I lactose intolerant?? Please help.?

Every time I eat anything cheesey lately like mac n cheese or cheese fries I get bad gas and very runny poop and stomach pains. They go away after having runny crap like 4 times...yogurt doesn't bother me though??? So am I lactose intolerant or not? Why does some dairy bother me but others don't ? I'm 19
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