new to squating

I’ve been squating for a month now and I’m finally feeling comfortable doing it and gaining some weight. My legs are slightly more than shoulder width and I go as low as my range of motion will let me which is about a foot off the floor. It feels like my hips fatique before anything else and the next few days they are the only thing that is sore. It feels like it’s a deep muscle right around my hip joint. If it is then I’m probably ok and it’s just something lunges or leg presses didn’t hit but I figure I’d ask before I injure myself. Also if this is a muscle what are some other exercises that work it since it is limiting my squat weight?

I had a similar problem earlier this year. Did a lot of work on hip flexibility, especially hip flexors and it came right almost instantly.