Please help: Unsure whether Im supposed to be paying this or not??

Haven't been able to find a straight answer online, tried calling, spoke to the bot only for them not to be available. I have a job and its a tuition plus zero hours contract, about 200 a month, started a second part time job that's about 2 hours after school from mon-wed, it pays like 200-300 per month. This second job i just started gave me my paycheck and its supposed to be 287 but PAYE took off 57 for tax??? I've never been taxxed before, Im only 19 and what I earn is not nearly enough to surpass the tax allowance, I'm so confused am I supposed to be getting taxxed? It could be because I started a second job but surely not as its minimum wage and not enough to meet the allowance?????????