Can I withdraw $20 even though I don't have that amount in my bank account?

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I currently have $16 in my bank account and I need $20 to pay for my math tutor for tomorrow's session. College life sucks especially when your job when my job doesn't give me enough working hours. Anyways I do need it the $20 pretty badly and either way I get paid next week. So can anyone help me out here?

Can I withdraw $20 even though I don't have that amount in my bank account?