Welcome to hell!
my advice is to stay away from it if you can. I'm trying to go back to regular seasons but I haven't managed it yet. Just play as many as you feel like if you do play and don't obsess about the 40 games. It's pure try hard with everyone desperate to win, sometimes the gameplay is horrible when the servers are over loaded too. If you are div 3-4 you will struggle with it to be honest. I play Div 1 and I struggle too. Also age is not a barrier lol, I'm a couple of years younger than you judging by your username and my record is very positive