Should I do a PhD

I work as a RA in a UK university (a top 10 uni) and applied for a PHD after encouragement from my colleagues. I just got an offer from the school and a full scholarship for 4 years.

However, I’m unsure if I want to pursue one. Academia gives me a lot of anxiety as growing up I wasn’t not one of those typically smart kids! I was one those who bunked school to hang out with friends.

I’m wondering if doing a PhD will be a bad choice and it would add to my anxiety. Also, that in the future that people will find out that I didn’t belong in the first place.

Any advice is welcome.

Update: it will be in social science and I don’t intend on staying in academia. I would like to move to policy and advocacy after this. A PhD is not a must, but would really help when working in the Global South. In addition, it will also be something for me.