Please no judgement

I already feel stupid/mean about how much this bothers me. My son will be 2 in January, when I registered him I gave him his dads surname, and from time to time it has bothered me that I didn’t either give my name or include my surname also. I feel like my entire life is dedicated to my son, every second of eveyday and it is not that way for my boyfriend. Our relationship has been rocky since our son was born, he found it extremely difficult at the beginning and still struggles with some things that just come naturally to me. I still resent him for all the nights sleep he has gotten and all the times he didn’t get out of bed in the mornings. Why am I still thinking about this this far on. (We are together 7 years) Apart of me what’s to start looking into adding my name on to my sons birth cert but also he is almost 2, do I really want to open this can of worms of his name being changed on everything, the upset I might cause from doing this. Or can anyone just tell me anything to make me feel better, it’s JUST a name that’s what I’m telling myself. My son knows he is my world and he loves me and I love him, and the fact we don’t share the same surname doesn’t matter . I might sound ridiculous to some, but please no comments that’s going to make me feel worse .