Taking care of your own children is entirely different and much harder than taking care of someone else's children.
If your baby is crying when you lay her down then she is telling you in the only way she knows how, that she does not want to sleep alone.
Mammals naturally are not meant to sleep alone. Sleeping with parents provides warmth and safety that are necessary to a child growing up to feel secure and independent. Pushing a child toward independence before they are ready just leads them to be more clingy and needy. If you show them you are there for them as much as they need you they will feel strong and confident and know they are loved, and thus feel ready to strike out on their own. And this applies to all ages, from birth to death.
I hope you can find a way to let your baby sleep in the warmth and comfort of mommy. I promise you it will not last long. Childhood is just a whisper anyway, over too soon.
My 10-year old slept in her own crib and then toddler bed in my bedroom for 2 years, then her dad left when she was 2 and I brought her in bed with me. She slept in bed with me until she was 6, then I met my second husband and she has been in her own bed since then.
My 3 1/2-year old slept in her crib in our bedroom until my husband deployed when she was 1-year old, I brought her in bed with me then, she just decided a few days ago she wants to sleep in her own bed in her own room. She did it herself. Child-led is the best way in my opinion.
My 8-month old slept in her bassinet for the first few months, but she often slept in my arms after we both fell asleep during night time nursing sessions. Now she is too big for the bassinet so she sleeps in her crib for a few hours at night, then wakes up and I nurse her back to sleep and then she sleeps in bed with my husband and me.
Babyhood's neediness doesn't last long, promise.