Best way to communicate that you don't want a job that you custody (12 days before start)

Hi everyone,<br><br>I'm struggling with how to communicate that I've changed my mind about accepting a job offer. I accepted the offer a week ago and it was to be expected in 9 days. <br><br>I've been job searching for 2 months. For several reasons, I accepted the offer without doing a lot of research, as I felt I was running out of time and I had to make a decision. The job was with the company I interned with in summer 2022. I thought I knew the company and the job, so I thought it was a safe bet. <br><br>However, I was very hesitant to accept the offer as I didn't feel happy with the job's responsibilities and working conditions. The pay was above average, but the job's requirements were very high and the work environment was very strict. I was very hesitant, and I wished to decline the offer. <br><br>Despite my doubts, I ended up accepting the offer. I thought I could learn to love the job and I didn't want to be unemployed. <br><br>In the last week, however, I've been doing more research and thinking a lot about whether I can do this job. I started asking more questions about the job and the company and I think I've decided that I don't want to do it.<br><br>My main concern is how to communicate this decision. I'm afraid that I'll come across as erratic, rude, or entitled. I don't want to burn bridges with the company, and I don't want to come across as someone who's hesitant or indecisive.<br><br>Can anyone help me with this? I would like some tips on how to communicate this decision. I think it's better to do it sooner than later, but I also don't want to make a mistake.<br><br>Thanks in advance.<br><br>**TL;DR**: I accepted a job offer 8 days ago. I've been researching the job and I've decided I don't want to do it. I'm afraid to communicate this decision because I don't want to come across as erratic, rude, or entitled.