Minimalist lifestyle/konmarie

I really want to do some spring cleaning, but I feel guilty letting go of gifts that people gave me that I no longer want/use. I’m all about donating, but I’d rather be sure these items go to a good home, rather than just do Salvation Army where they make mostly profit.

So questions are, how do you let go of the guilt? How do you politely tell family that you want to live a minimalist lifestyle and decorative items aren’t desired? (Without sounding like an ungrateful b*tch bc I truly do appreciate the thought, but a lot of what I have doesn’t suit my taste). And any suggestions on where to donate other than large name donation places?