Like it or not, you're going to be paired up with, and live with, somebody who, until very recently, you didn't know at all.
Normally, the both of you will make it through the company training phase unscathed, and you will move on to your own solo career.
Personality conflicts are almost inevitable, but your job is to stick it the best you are able, and learn how to safely operate the vehicle. There are occasions, however rare, in which trainer & trainee just can't stay together until the end.
For new drivers who aren't used to it, it can be kind of strange. You are living in a tiny space with a stranger who has been tasked with making sure that you are ready to drive a truck by yourself.
It's something that every new driver has to go through, and it's another situation that you want to do more listening & learning than talking and worrying.
You may find yourself waiting around to find a trainer, depending on the company. There are cases in which new drivers are sent home to wait, but usually the company will be pretty good about getting you out on the road.
There may be a longer wait for female drivers who want to wait on a female trainer, as there generally just aren't that many of them.
Company training is stressful for both the trainer and the trainee, no question. You're kind of forced to be around a virtual stranger 24/7 for weeks on end.
Normally, we would suggest trying your best to make the situation work. As a rookie, you are there to learn how to do the job safely & efficiently, and one of your biggest challenges will be adapting to less-than-perfect situations.