Venting

First time mom. breastfeeding my baby boy. My baby is so tiny he was just 2.6 kgs when he was born. By the time we came home his weight was 2.4 kgs. I am a obese person. That too a first time mom. My baby is so tiny. I am scared to him. My breast are huge and saggy. I am scared I might kill him with my breast. I am not even sure if he sucking or swallowing. I am not even if he is latching correctly. I dont know what to do. I want him to gain healthy weight.

Sigh.