Hello Mucky Jeans
Your son is so not alone and as long as he is keen to speak to someone, a counselling psychotherapist may be a good option. I can recommend Penny Marr, based in East Sheen and her details are here on the BACP website. All teens need a strong wise man or women, in addition to the parents, who can listen and support and this does not have to be a professional, but can be someone who they feel comfortable opening up to.
However one of the key pieces in this is for you to know how to support him and have the core skills to know how to connect and communicate and validate his feelings. I believe we as parents have the biggest influence on our children's self esteem and their ability to problem solve and come up with solutions. However we need to know how to help them be emotionally intelligent and help them recognise, respect and respond to their feelings and other peoples, and this for many of us is not an intuitive skill.
If you email me at firstname.lastname@example.org
, happy to share our publication on boys and their emotional world and this will give you much insight into what you can do as a parent
Take care and hope you get the support you are looking for