This study compared the caring situation, health, self-efficacy, and stress of young (16-25) informal carers (YICs) supporting a family member with mental illness with that of YICs supporting a friend. A sample of 225 carers, assigned to a family group (n = 97) or a friend group (n = 128) completed the questionnaire. It was found that the family group experiences a lower level of support and friends experienced a lower positive value of caring. No other differences in health, general self-efficacy and stress were found. YICs endure different social situations, which is why further study of the needs of YICs, especially those supporting friends, is urgently needed.