Life is so complicated and I am terribly lost

I’m 21, and a senior in college. I have to make important decisions in the upcoming months as to where to go? what to do? and I’m so lost. All my peers (21-26) are doing great things, some have jobs, some are moving in with their boyfriends/girlfriends, some accomplish great things, and I’m just there, I haven’t accomplished much and I don’t know what I want to do for the next chapter of my life. I feel like until then everything was pretty much decided by “society”. Kindergarten->Middle School->High School->College, this is something that we’re told to do and don’t get me wrong I’m glad I did it, I’m just saying that it’s now time for me to decide for my future and it’s terrifying. What if I make the wrong decisions? What if I don’t succeed? What if I mess it all up? It’s so weird because none of my friends or peers seem to struggle as much as I do, most of them are gonna start their new jobs soon, my cousin (21) just bought herself a car and is moving in with heur boyfriend, most of my friends are in relationships, my other friend (23) is getting married, and I’m here with nothing, doing nothing, being nothing. It’s just hard and I’m scared I’ll end up being a big failure, it’s one of my biggest fears honestly, and everyday I see others achieving new milestones in their life and I still don’t no matter how hard I try and work and it’s all very humiliating and discouraging. I don’t really know how to move forward right now, any advice?