I have started with this website a month or so ago. Back then, I never knew what my rating was. What I did know was that I had been playing chess since I was five (now 15), but hardly read any books or studied.
Really, just don't worry about rating. It's not a score just a relative indication of strength. A month isn't very long and you have not played a lot of games yet. See where you are after five hundred games.
In the 800-1100 range there really isn't much difference in playing strength. Games are often decided by tactical oversights in the middle game or opening traps or blunders inside the first 20 moves.
You are in a rating band that is both large and has a lot of improving players due to age and very positive benefit to study ratio.
Learn basic endings. Have four to six openings that you like that cover the majority of the replies you see. Then study tactics a lot! The recommendation of a tactics book that is organized by motif is a good one. It'll only take a 1-3 months to get through a 1000 or so,but you will be much better as a result.
Maybe if you stop focusing on your rating during the whole game, and instead focusing on your gameplay, this would not happend.