I don't believe that expression/saying was intended to imply that no one can ever help you, in any way...

I believe it's meant to convey that that the individual is responsible for doing all the 'heavy lifting' when it comes to helping to improve their mental/emotional state. Others can support you, encourage you, and inspire you - but you have to do the hard work that is required to produce the significant changes in your life that you long for. No one else can do that 'heavy lifting' for you and no one else can produce those changes for you through their own efforts... You have to take on the primary role in helping to improve your condition - you can't assume a passive role....

I believe tha saying/expression was intended to inspire and empower....