fighting all naps and bedtime normal?

Samara
Hi ladies, up until recently my little guy who is 6 months old nursed to sleep for every nap and bedtime but has since stopped wanting to do that. So now I rock him and pat him, sing to him or shush him which works, but the issue is he cries and cries for 10-15 minutes until he falls asleep. Is this normal? Nursing him to sleep was so peaceful with no tears so just feel bad if I'm doing something wrong.