Do you think that I should leave my job after only one week?
What makes you want to leave a job a week after starting it?
I found a much better job at the local supermarket where I can get tips.
It sounds like you found a great opportunity, but you should customarily give your employer a two week notice before quitting so that they can find a replacement.
This is a good chance for me to move forward in my life.
If this is something that is really important to you, then I say go talk to your current employer and explain the situation to see if they are okay with you leaving abruptly. You can also offer a two weeks notice to be considerate.