[burntoutfire]

Hang in there. You're learning a ton every week. With time, it will get much easier. Also, don't compare yourself with the collagues that started with you, there are innumerous factors that might make them perform better - maybe they've already worked with similar problems or tech stack before or maybe they just have better genetics (are smarter or can focus for longer - you have to accept that you're not the most gifted person alive and be ok with it).

Also, if you have one-on-ones with manager and they seem like a decent person, you might hint at your frustration with your apparent slow progress. Or you might try discussing it with some senior. If you're likable, a lot of people might jump in at the opportunity to mentor you.