Am I wrong?

Am I wrong for not wanting to give my child a sibling? A lady that my mom works with basically acted like I needed to give my son a sibling or he'll hate me and grow up lonely.🙄 What makes it worse is I'm only 18, and she's acting like I need to give this kid a brother or sister now. Plus he's only two and even if I did want to give him a brother or sister I would want to wait until he's older and I'm more financially stable. I don't want anymore kids. Honestly I didn't want kids at all before he came along. I'm a single mother and I love it being just me and him, he gets every single ounce of my attention and love and right now I'm fine with things the way they are. But I feel bad because this lady made me feel so shitty just because "I'm going to let my son grow up an only child." Usually things like this doesn't bother me, but she kept on and on about it.