Stuck and Frustrated!

I'm in a similar predicament to many others' posts I've seen. I started trying to lose weight three months ago, started at 167. I've lost 14 pounds total, but only 4 in the last two months! I'm so frustrated and feeling so hopeless because I'm doing so many things and not getting the results. I'm 5'7", a teacher (so I walk a fair amount throughout the day).

For workouts, I work out 4-6 times a week, doing strength 2-3x, cardio 4-6. Typically I burn between 500-1000 calories each day. The workouts are different everyday. I also try to get 10,000 steps every day.

I eat about 1500 calories a day (I was trying to stay around 1200 for the first two months, then when I was pretty stagnant, someone suggested I eat more and might have been going into starvation mode. I then started eating every couple hours and lost the last four pounds). I stay away from most processed foods/fast foods, eat plenty of protein, lots of fruits and vegetables. I drink approximately 80oz of water every day. I also eat something every 2-3 hours to keep my metabolism up.

I'm frustrated because I can't figure out how to know if I'm eating too much (and not losing weight) or not eating enough because of the amount I work out (and not losing weight). I've figured out my BMR and using the Harris-Benedict equation should be consuming about 2500 calories a day to stay at my current weight.

My thyroid is fine, I've spoken with a doctor who said it will just come off slower and he wasn't concerned. Just hoping to hear similar stories and hopefully some helpful advice!

Thanks