Inner right thigh pain help?

Today I started experiencing inner right thigh pain while on the computer I do usually sit with my right leg up on the chair kinda like Indian style but only the right leg. It was a sharp pain not that bad though and it doesn't hurt when laying but does hurt when walking up stairs or sometimes just walking. No redness and no swelling. I'm only 18 and I don't smoke or drink and I get up atleast every hour or every other hour and walk a bit. I do spend like 4-6 hrs on the computer. I was thinking it might be a pulled muscle cause the way I sit stretches my inner right thigh a little. Any ideas? Could it be a blood clot.