Reddit reviews My Youth Romantic Comedy Is Wrong, As I Expected @ comic Vol. 1
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I think what you are reading is the Light Novel buddy. As its name says, it's a novel and it's mostly letters with some illustrations in between. Manga is like a comic, with full drawings and dialogues globes.
Oregairu is a Light Novel Series that have 13 volumes published until date. The anime covered until the end of Volume 11. Season 3 is supposed to cover Volumes 12 - 14 (which is stated to be the final one).
If you want to read what happened in the anime in the Manga version of things, I can recommend to you the official translation of the manga by Yenpress It doesn't cover everything of the anime yet, but it covers Season 1 and Season 2 up to episode 8-9 I think, so it's a good start.