The effects of not having friends depends very strongly on the individual. That means, if you yourself think you need friends, then not having any will hurt you very much and turn you into an unhappy, incontent person. However if you don't see them as necessary, you can be fully content with your life without friends. Biologically however social interaction is natural for humans which is why through instincts we look for other people's company.
It is highly unlikely for a teenager to become incontinent from sleeping in a crib. Incontinence, or the inability to control bladder or bowel movements, is typically caused by underlying medical conditions or physical health issues, not the sleeping arrangement. If a teenager has concerns about incontinence, it is advisable to consult a healthcare professional for an accurate diagnosis and appropriate treatment.