If I miss a prayer, am I out of Islam?

Sometimes I sleep through the prayer time. Other times, I think I will pray after my tuition but tuition takes longer than expected making me miss the Salah time **Does this mean I will be kafir?** *Please answer i am scared ...* I am very scared. I did not intend to neglect the Salah. I am scared, my hands are shivering, please answer. ***Will I be out of Islam?***