You have absolutely no idea what you are talking about.
Psychology is not about contemplating your own motivations, or bringing up repressed memories. At least not any more (sure there may be some relics who still practice it, but recent psychology has moved on). More and more, it's about recognizing your own distorted thought patterns, and learning how to have a healthy relation with them. It's not about blaming other people - even in cases where blame could be placed.
Some people with mental illness have events or people in their past who contributed to their illness. Many do not. Many just have poor coping skills, coupled with distorted thoughts which end up forming a negative feedback loop - spiraling into deep depression, anxiety or panic.
These things can't be cured with good advice from your parents - unless your parents are well versed in mental health. However, in most cases they can be helped a lot with therapy. Most current approaches are also evidence based (ACT, DBT, CBT). Not complete pseudo-science.
Some mental illnesses do not respond as well to these therapies. In many of these cases psychiatry can help. While drugs have side-affects are not not perfect, they can often take some who is not functioning at all to some who can function - maybe not perfectly, but good enough.
It's be foolish to say psychiatry or psychology are perfect. I have not doubt we'll make a lot of progress in both areas over the coming decades. However, they help a lot of people desperately in need of help.