Is it normal to believe i have misophonia?

I've always been sensitive to certain noises since I was young, but it was mostly very loud ones (cannons going off, firecrackers, and thunder). These noises don't bother me too much anymore. However, snoring has always bothered me. Then during my high school years I developed a sensitivity to people sniffling, especially when they sound like they're snorting something up. It got worse when I entered college. Now, not only is sniffling and snoring a problem for me, but I absolutely can't stand to hear people cough every other second, especially if they hack when they do it. I also hate hearing people clearing their throats, especially when they do it so it sounds like a rusty old car that's trying to start. My sister has allergies and asthma, so she's always sniffling, coughing and clearing her throat. My mom smokes, so this is not unusual for her either. I know this is a very mean thing to say, because they can't help it, but I often feel like I live in a doctor's office instead of a house. I don't spend as much time with my family because of my problem, and it makes me feel terrible. I often shut myself up in my room and wear headphones. My mom and sister say "Just get over it." I've told them that misophonia ( a rare disorder where you can't handle certain everyday sounds) is real, but they think I'm just being mean. My boyfriend knows and is the only one who understands. I have been struggling with a form of depression too, and this is partly why. Please, no rude comments like "Get over it, they're just noises" because I can't just get over it. Could I have misophonia? Is it normal to think I may have it?