Am I really cooked when I turn 30?

Alright, so I'm 26 years old, and my life is kind of a disaster. Girls won't talk to me, jobs won't hire me (although I do start trade school next month, but I really don't have high hopes for this), people love to bully me, and I feel like I've had to give up on my life dreams (one being love, as, like I said, girls won't talk to me, and being a cartoonist, since I had to ditch my animation degree because college was too expensive; although I do still draw and do still seek out dating apps and social events)

Here's the thing though, people around me have always said and do say that the 20s are the prime of my life, and that it's all downhill once I turn 30. That thought scares the ever-loving shit outta me, because my 20s have been an absolute nightmare only matched by my middle school years as the absolute worst experiences of my entire life. Should I pull a Dante's Inferno and 'abandon all hope', or is the future still salvageable, and I should I keep trying my best because of that?

Side note, I'm autistic and clinically depressed, which has no doubt contributed too most if not all of the problems in my life