They also point this out when you look at any of the hero or troop cards. They all have a message below them warning you of this:
This is a game that rewards patience and skill. No one is good at it overnight.
It takes time to acquire heroes, time to ascend them, and time to learn how to use them to best effect. You can spend money to get heroes faster and ascension materials faster, but there’s only so fast you can go.
There’s lots of very good advice on this forum about how to build teams, how to become successful at raids, and good strategies for Alliance Wars.
I’d encourage you to stay awhile and learn about the game. I sucked at raids when I was starting out. Now, I can beat much stronger opponents 70% of the time.
I’m confident that with some time and effort, you’ll get there too.