Need advise

Hey folks, So I work as a product intern and have an offer to join full time as an Associate Product Manager at a Fintech B2B startup upon graduating. So cutting to the chase, Recently I have been under tremendous pressure to deliver a product. Our organisation does not have any senior product manager to help guide and I report directly to the CEO. I have been given far too much responsibility and an extremely sophisticated product has been put in my care. This product requires a lot of technical expertise and we do not have that kind of resources. I have put this point across to my boss multiple times over the past few months and he always says we will do it. He goes and promises clients that this product exists they even did a soft launch of this product when we literally have not built more than a few screens. Our company has a high employee turnover and people keep quitting left right and centre due to the Co-founders toxic attitude. Recently I have been feeling very anxious starting work in the mornings. Most days go late into the nights because the Co founders work in a different time zone. So the dilemma here is this, I feel the urge to quit this job but at the same time I am afraid that another opportunity will not present itself soon. They also pay me pretty well compared to other product intern roles out there. I know a lot of people are out there fighting for a product intern or an APM role and here I have it and am considering quitting. Please feel free to ask me any follow up questions and forgive me if it sounded more like a rant. I am open to hearing your advise. Thanks for taking the time to read this.