Pretty discouraged

Dionne
I'm turning 42 this year and I have a child whom will be turning four this year. With my mom, there was two of us and my mom said it was so no one would ever be alone. Well it took me the better of 19 years to finally have my miracle child and now she's getting older, she's so alone. Her dad and I have been ttc for about 18 months, ever since we noticed how lonesome she was. She see children and instantly want to go play with them regardless of how old they are. When they either ignore her or she can't go and play, she cries her eyes out. I'm so heartbroken because with every month that passed her loneliness grows deeper and I just want to cry. I feel like I'm a bad mom because I can't seem to give her the sibling that she she so desperately desires. I felt like less of a woman when it seemed like I'd never be a mom but now my heart has sank because I can't cure my baby's time of growing up by herself. I don't have another 19 years to ttc and I just don't know what to do.