Feel like im not qualified for a better job.

Im in student debt so going back to school isnt a option, i got my cosmetology license which is now expired but its never what i truly wanted to do. In the moment it was what i thought i wanted and i regret it ever since. After having my 2 kids back to back i lost interest and started working at DD since April. I am constantly unhappy waking up early to get to work at 6am (use to be at 5am) and not sleeping or resting well because my 9 month old still doesnt sleep though the night. I get off at 12pm so im happy i get to watch and take care of my kids. They wake up around 10am so my bf doesnt need to do much. I cant imangine working at a normal job with normal shifts because that would mean taking the kids to my moms house and have her watching them. I trust her so much but im feeling guilty since they've been born i havent been away from them too much, i was a sahm for my daughters first year and a half so i keep thinking of the worse things that can happen to them. DD is 2 years old exactly and my son is 9 months. Iv been thinking this for a while now and cant decide what to do. If i dont leave my job i will probably get fired anyways because i call off more then i should. We are always short staff and constantly doing double the work or being by myself at the sandwhich station which gets super busy in the mornings. Its alot of work and im constantly tired and been depressed. Another reason why i stay is because of the tips. Sometimes we get decent tips. Making my pay like 3-4$ more an hour. If i get paid 11/hr with my tips on a great day usually on weekends it will be anywhere from 14-15$. Min wage in the city is 12 and will be 13 next year. Maybe a few dollars doesnt matter but it makes a difference to me. Every time i decide to start searching on a new job i hold myself back and tell myself to just stay where im at. My bf doesnt seem to want me to leave either he hates the idea of having to work around a new scedule or drop them off at my moms house/picking them up of figuring out how i will get to work. Can anyone just give me some helpful advice or words of encouragement? Sometimes i feel like quitting all together but we're not in a good place for me to be off a income for so long.