Click here to contact The MindClinic for a free, initial consultation to discuss specific counselling interventions tailored to your specific personal circumstances and experience of lack of confidence, and help you improve your mental health.
This should cover what personal data you are capturing and why, how it is stored; that it is stored no longer than strictly necessary, that it will not be shared with third parties, the rights the client has to request information about what personal data you have about them and that they have the right to have it deleted on request.
There may well be a standard template available from your governing body. There is one for psychotherapists from UKCP.