I have very sensitive, very acne prone skin and my makeup doesnt last even 3 hours. I normally use MAC studio fix powder and clinique blush. What will look aswesome but not be too much for my skin?

I have this slight redness in my upper cheeks and I went to my doctor and she said that it wasn’t rosacea and she wouldn’t refer me to a derm. My evil sister loves to make fun of me and call me..and I quote a rosacea faced bitch. My parents, family and friend seem to think it’s a natural blush. It’s not REALLY REALLY RED, but noticeable up close. Can anyone tell me the difference between a natural blush and rosacea? And how I could reduce the redness? I have no acne. Thanks! And i’m 17.