Yeah this is normal for male puberty. It will fluctuate, start sounding deeper by the start of a sentence and then go low and feminine sounding again by the time you finish talking. Plus sound deeper on some days than others. I hated this phase as it made me feel like I was making no progress whatsoever, but my voice started to sound constantly deeper and male by 3 months, even though I still sounded like a 14yr old. By 5 or so months it started to sound a bit more grownup. So you're just going to have to ride it out 🙂