You are important. Whatever worries, whatever fears, whatever pain claws at you ... you do not need to hide from it. I cannot speak for the others, but in the end you being content, being comfortable, knowing that you have others to lean on is what matters. And despite what your mind might say, caring for you is neither burden nor chore. There is very little I would not do for your sake.

Lily and D.Va are younger. They lack self-esteem and are still growing and learning, but I highly doubt they want perfection or complete composure from you.

Your companionship is sought out for you and all that you are. To cherish the pleasant times and support you in the difficult ones. Just as you would for them. I doubt you would be pleased if they hid their worries and concerns for your sake.