I'm turning 27 soon and honestly I'm feeling this sneaking up on me. I'm not sure if I'm afraid I'm not improving fast enough or that I don't have the drive to

I'm turning 27 soon and honestly I'm feeling this sneaking up on me. I'm not sure if I'm afraid I'm not improving fast enough or that I don't have the drive to be a founder. Previously, I've basically only worked at growth stage startups except for a brief stint at a FAANG.