It feels like every opponent I'm up against is a smurf or is disgustingly better than me (<lvl30)

Been playing a ton lately trying to level up my account to level 30 so I can play ranked. But every game now it feels like I'm up against people way better than me (higher level, only mastery champ is the one they have at mastery 7) and they all feel disgustingly mismatched. I'm hoping as I get more champions I can play more around this, but for the time being it doesn't feel fun or engaging at all, it just feels like I have to decide 'how hard to lose' each game, because my laner/opponents will smash me and my team.

Non of this is my team's fault, it just feels like there's something wrong with who I'm being matched up against. Not trying to complain, I love the game, just wanted to say what's been bugging me lately.

Thanks to those who take the time to read this.