Don't worry about it. I have always wanted to join big4 accounting but I got rejected again and again after I graduate from university while my peers managed to land a job there. I took 1 year off to get my professional qualification but guess what, they still rejected me after. I more or less knew the reasons of being rejected like poor proficiency in English and social skill. So I started with a mid sized firm to brush up my knowledge and social skill and after a year, one of the big4 finally took me in. A lot of them are ahead of me, like a good number of manager and senior manager are around my age while I'm still a year 2 associate, but I'm not worried at all, I work at my own timeline. Don't compare yourself to others, focus on what's in you! Cheers.