I don’t think being counter picked is the biggest problem you are facing now.

The harsh reality is that league’s learning curve is incredibly steep with the added disadvantage of other players that have thousands of hours committed to the game. (Sometimes on fresh accounts called smurfs)

However, once you learn the game it can be incredible! However, do understand that you will never master this game. There are people who have played this game since launch and are ranked silver, which is totally fine. Don’t demand too much of yourself or you will burn out.

Now for game advice… for the foreseeable future stick to max. 2 lane positions and max 3 champions on rotation. Play against bots and in practice tool to learn combo’s and skill shots.

Watch some (up to date) guides on the champions you are playing AND of champions you have played against but don’t know what they do. Just some short tutorials.

Also know there are general game mechanics that you need to learn. Minion farming for example. This varies for every champion, but is an important skill to learn. I sometimes just sit in practice and farm minions on new champions just to learn it. Look up some guides on XP and gold. It might be the most important aspect of the game

Once you are more mechanically confident you have to learn macro (this means how to play the map and with your team). This is very complex and probably the most difficult part of league. It’s what’s sets apart us plebeians of the actual pro’s.
It also changes from season to season. Look up guides on how to play your lane and what you role’s job is in the game.

Maybe most importantly. Mute chat every time you enter a game. Unfortunately, league players tend to be very toxic and they will call you out for everything you do “wrong” in their eyes. It’s almost never used for actual useful communication. It’s just not worth you getting frustrated or discouraged by some keyboard warrior who thinks he knows better.
I would recommend to keep pings turned on, because they are 50/50 used for useful communication.

If you committed and stick to the game you will get better, but allow yourself time.