Tbh I would stick it out a bit longer. It might be the school you are working in. Teachers say that PGCE year and NQT are the worst by far. I am on a secondary PGCE and the school I work at annoys me with its incessant scrutiny of pettily minor 'professional standards', but I know from friends that it is different elsewhere. Some people take longer to start planning quickly - I for example am a bit overwhelmed by the prospect of 10-15 lessons a week (which will be the case for me in a week or 2) because I take too long planning; that will definitely change.
I work evenings and weekends and rush lunch - many PGCE people I know do the same. But most teachers I know make a point to not work on weekends and also make time for themselves in evenings.
If you leave now you will always wonder if, had you seen the course to its end, you could have ended up a happy and successful teacher.
I think that if you are careful in choosing where you work after this year, you might be fine.