As someone who has panicked in life as to what my measure of sucess is or is not I can relate to your request.
However what i will tell you is that there is no measure of success, only a measure of your own happiness with what you have, if you are not happy with what you have then the only person who has the power to change this is you (unless you have a rich uncle that leaves you millions).
Dont take this as a negative response, I'd like to think that whilst I am not perfect in any way I am currently satisfied with my lot in life, when i become dissatisfied I'll go about changing it or accepting that this is the best its going to be.
Self motivation is really difficult for me, but i deal with this by constantly challenging myself to do something new or different.
I dont believe that anyone can tell you what your measure of success is only you decide this.
People may disagree with me on that but that's just my opinion on this.
If i can help i'm will if you feel that i cannot then good luck to you.
H