Not getting into YC hasn't slowed me down one bit. I'm on my second attempt at growing a business and I'm far smarter and self-aware than when I started. I'm doing quite well on my own now. I'd still probably benefit from YC a lot, but if I never get in then so be it.
Edit to the reply below
I'm just curious as to what benefits you get. I know of the program. Though I'm not their target market.
Im not being pedantic, just genuinely interested in your POV.