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I don't know.. I know this is negative talk, but it feels like it's just harder for me to get fit. maybe some people are not meant to be fit?
It is harder for some people - psychologically!

I'm quite certain that nearly all people can at least getter fitter than they are. There are some people with various disabilities who will never be what we recognize as fit - but I suspect that even they can be fitter than they are.
YOu will continue to get sore - not as badly, in more of a good way - as you push yourself to lift more/heavier. Don't compare yourself to anyone else, just measure how much better you are doing now compared to where you were. All weight lifters have to start lower and move to heavier weights. You wouldn't expect to run a marathon if you'd never run before, right? So don't expect to lift heavy from the beginning - you have to work up to it.
Your cardio will likewise get better - you'll have more endurance. As for stretching, many of us are very "tight." Do what you can after you exercise. At some point you might want to try a yoga class or tape that will help you get more flexible....
Don't get discouraged - you're doing great! Just have patience, you'll get fit in the end.
