Hi there,
Driving is a new experience and there are going to be days where you make mistakes - big or small.
Even after you pass your test, you are still going to have days that leave you questioning where you went wrong. I have been driving for three years now, passed first time with just three silly minors, but I still have days that make me go: "What was that?" It happens and you should just take it as a learning curve.
I never cried during or even after my lessons which surprised me as I can be quite emotional and often beat myself up over little mistakes. However, I did have days that have left me feeling a bit down and annoyed with myself. I remember just making a load of stupid mistakes one day and taking ages to get to places because I kept getting things wrong.
One thing to remind yourself when you are having a bad day is that you are learning and you will never be perfect 100% of the time. Even those that are experienced make mistakes, we move.
Shake yourself off, take a deep breath and make sure you don't do it again. Speak to your instructor and ask for advice; that is what they are there for.
Keep at it and it is okay to get a little upset and worked up about these kind of things. It is normal, 100%.