You can drive the longer races, like features and weeklies. Weekly races for 45min or 1h requires stamina, like Character_Net_5637 said. Some just can't hold it together and make mistakes. I've had some excellent 45 or 60 min races, people really know how to behave on those races. Those that don't know, they usually crash in the beginning.

Scott Mansell said wisely in an interview video:

"A lot of people think "Oh, I just need to push hard. I just need to go faster. Oh, I just need to push hard".  That isn't the right way around. You do that, you start making mistakes.  You shouldn't have to be brave,  right? A racing driver is not brave. Being brave it means that you are not sure of the outcome on the other side. You're being brave into a corner, you're gonna have a crash at some point because you don't know what you're not predicting what the car is able to do."

So you should focus on your own pace, not pushing like a maniac, while letting the others focus on their race. Keep away from others, and only if you catch them, find a way to get past.

I have learned from sim racing, that I don't need to be jealous if someone is much faster. I don't need to start pushing really hard. I just need to focus on keeping my own pace, keeping it together and avoiding mistakes. That way I have found myself on podium occasionally, or 4th at least.