I can't do squats without falling on my ***?

Or lunges either. I'm a beginner, and I want to get rid of the fat on my thighs and be stronger. It's extremely discouraging when I can't even do a simple squat or lunge. I read how to do it online, but I still suck at it. I can't keep my back straight while trying to do it, I can't do it the... show more Or lunges either. I'm a beginner, and I want to get rid of the fat on my thighs and be stronger. It's extremely discouraging when I can't even do a simple squat or lunge. I read how to do it online, but I still suck at it. I can't keep my back straight while trying to do it, I can't do it the normal way. And if I try o while not keeping my back straight, I only end up feeling pain in my knees anyway, instead of on my upper thighs where I want to get rid of fat. What do I do? Should I just give up on this exercise, and do it later if I get stronger with other exercises?
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