Ideally, we'd all have a practice space where we feel free to make loud, experimental, and maybe unpleasant sounds without the worry of bothering a neighbor or housemate. While this is rarely possible, try to find a way to make yourself feel comfortable letting loose in the space you do have. Concern for others' ears and the insecurity that builds out of fear of judgment only lead to vocal tension and limit our exploration of new sounds and sensations. It may take practice to override the worry, but continue to give yourself permission to take up vocal space. Playing white or pink noise in the background can act as a sonic security blanket and help us feel less vocally vulnerable. Try turning up recorded rain or ocean sounds when you sing - you may find your practice space more conducive to confident vocalizing and less restraint-induced strain.