Don't over think things - it really isn't necessary - and simply go with whatever you may feel comfortable with. Stuffies are emotionally reassuring so if you get anxious - and much in the adult world gets that way - just do it.
It is as how it manifests itself in your emotions, mannerisms and dress. You may dress more like a woman of the same chronological age as you in everyday situations, you may elect to dress more "little" or more "bedroom" and neither are wrong. Some people aren't particularly sexual, some very much are while others can switch which is pretty normal for any legal adult as we can't be 24/7 sexual as we've other things to do.
Just be the sissy YOU are and be open to exploring your own interests.