Is it likely that I have short sleeper syndrome?

I'm a 16 year old female and ever since I was 12, I've been experiencing fatigue throughout the day. I've always consistently got 7-8 hours of sleep, but been very exhausted. For the past couple years, I've been taking naps 3-4 times a week, often every day in the winter months. It also takes me a while to fall asleep, usually between 30 minutes and an hour. Short sleeper syndrome is in my family (my mother's father has it), so I'm wondering if I have the gene. I'm wondering, am I always so tired because I'm getting too much sleep? Would I feel less tired if I got 4ish hours of sleep every night? Any answers are helpful, I'm not super familiar with SSS and I'm seeking more information on it.