If you find yourself struggling to parse traditional philosophy, which honestly is likely if you aren't planning on taking a philosophy course I'd suggest readi

If you find yourself struggling to parse traditional philosophy, which honestly is likely if you aren't planning on taking a philosophy course I'd suggest reading philosophical novels. Camus's the stranger and Sartre's no exit are great works that are foremost page turners while also demanding considerable thought. I like thus spoke zarathrustra a lot but it will be difficult with no background. If you want to get serious read the greeks. Beyond that it really depends on which area you're interested in. The Stanford encyclopedia is a great resource. I'd stay away from Hegel and Kant at first, although they are incredibly influential. They'll probably turn you away because it's so hard to parse.