Feeling overwhelmed 😔

Two nights in a row baby is screaming at bed time. His routine is bath time, pajamas, darken room with white noise, short story, and breast milk (he usually falls asleep with the boobie). We introduced a bottle at night for the last week bc he is not gaining as much weight (but he is tall) and he loved it. When he finishes de bottle, he seems sleepy, but when we put him to sleep, he starts screaming. After a few minutes of screaming, he finally takes the boobie and falls asleep. It has been like this the last two nights, but he is napping well during the day (3-4 naps / 30m-2hrs).

I feel like the worse mom because I know I need to let him learn to sleep on his own, but I have tried to put him drowsy on bed and he wakes up right away and cries. I have tried pick him up and put him down for about an hour and a half and he never falls asleep... so, I gave up and keep help him to fall asleep with boobie, pacifier, or holding him... it usually works, but the last two nights nothing seem to be working... 😢