Wanting baby #2 right after my first

So my son Is 9 months old and my husband and I are going to starting trying for baby #2. I kind of feel a little selfish for wanting another child so soon after having my 1st. I guess I'm afraid that I will not show hom the same amount of attention and leave him feeling left out. I want my kids to grow up together close in age so they have things in common and can play together. I guess Im afriad that he will end like me, I have a older sister 9 years older to be exact and we have nothing in common we don't have thay sisterly bond that most siblings have, we hardly speak to one another ( only through Instagram) I want him to grow up with a little brother or sister and have that connection that siblings have and not feel alone... Ugh!