Am I bound to have blood clots or any other health problems?

I'm not gonna lie. I stay sitting a lot to play Minecraft. I usually stay playing it over 6 hours. I used to do exersise but I can't anymore because this treadmill we have broke so I can't use it. I've stopped in April or May. I've been playing it for about over a month. My legs feel sore (like when you do too much exersise) and I haven't done any exersise.
Note; I'm 17 and I'm not overweight.

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