Why should I want my baby?

I’m (21F) pregnant, about six weeks. I don’t want this baby as im afraid of the unknown, what it will do to my body, my career, or mental health. My husband (23M) doesn’t understand why I don’t want the baby. We’ve both expressed that we want children eventually but he is confused why I don’t want it now. I’m dying to have a maternal touch within me to just shake me up and realise that it’s the most rewarding thing but nothing it working. I keep mentioning an abortion to try and get him to understand that im not joking but everyone in my support circle is…. Unsupportive.

Why should I want my baby, I want it but I feel my selfishness is stopping me from carrying to term.