How to fix FPS issues while gaming?

I recently bought a new gaming computer that has a Nvidia Geforce Gtx 980 gpu, 16gb of adata ram, and an Intel i7-6700k cpu, but I only get around 150 fps on Minecraft, and I can't even get solid 60 fps on Skyrim on Ultra graphics. I watch Youtubers who have worse pc specs, but get way better frames even while recording. Please help.

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