You are five and a half feet tall and you weigh 148 pounds. You are going to need to get bigger. Lots of women weigh more than you and they are not fat. Here is Cecily Basques squatting 350 pounds (158 kg) at the meet I held in October. She weighs almost exactly what you do. Maybe a pound more. I bet you that she could squat 315 pounds for a set of five.
Cecily lacks a biochemical advantage that you have—high levels of testosterone. You, my friend, must acknowledge your hormonal gifts and put them to use. When you fail on a weight once, it is not time to deload. It is time to get really pissed and go after it again next time. Fuck gravity. It is laughing at you. You think 350 pounds felt light for Cecily? No. Next time you feel like quitting, remember what Marlon Brando advised:
Stop trying to add five pounds to your presses. Use smaller jumps. Eat more. Eat more protein. The weight will always feel heavy. ALWAYS. You make the weight on the bar go up by the power of your will, not because it feels good. It feels bad. You are forging your body. It is hard, uncomfortable work. Embrace that. Banishing weakness requires suffering on your part.
I cannot vouch for form checks on BB.com. I can, however, vouch for them here. There may be things you are doing wrong. In the meantime, put some Bolt Thrower on your headphones for your work sets and make the weights go up. If you need a light day on the squat on Wednesday, take it, but find some weights you can move, make well chosen jumps, and keep going after it. Learn to clean, too. Did I mention that Cecily can clean a lot of weight, too? Be like Cecily.