Foster Parents Looking For Advice

I want to thank everyone for their advice yesterday on my 14 year old foster son and how to make him feel more comfortable. Today we took him to the doctor for a physical and to also find out about the bedwetting. So the marks on his inner thighs definitely seem self inflicted. So I'm gonna be keeping an eye on him to make sure he isn't self harming. For the bedwetting the doctor said he has a smaller bladder than he should. Mixed with the trauma. We have him using goodnites (pull ups for older kids). He hasn't really complained about it even though I can tell he's really embarrassed. Am I doing this parenting thing right. I don't want to fail him like the system already has. I'm scared I'm messing up. Any advice would be appreciated.