So if they can... why can't I?

I've been sending my resume for about 3 months to companies in Mexico for them to hire me. At first when they called me for an interview I was scared, I mean having a job means having responsibilities and I'm still stuDYING and last semester I had 8 (subjects?) classes in school and I found it pretty tiring and well you have to wake up early to go to work, but I got home at 11:30 pm and well I thought when am I going to rest?! ...Well I still have no job and I realized it was all my fault. Because I've been sabotaging myself in my interviews because of what I say to the interviewer.
Today I made a decision. I want to work and I commit myself to be present in both job & school, because I've seen classmates in my school that do it. So if they can... why can't I?
Wish me luck! :)

Good luck!