I believe that when you say to yourself "That person thinks I am not successful", you set two things in motion right away.

First: You program the person's behavior towards you so that the effect "I am not successful" is projected towards you through them (or the idea or experience is reflected back to you through them)

Second: You also get to further explore the "I am not successful" experience by reaching into the ocean of consciousness & discovering how else you can participate in the "I am not successful" adventure, because you have access to all the other human beings versions or definitions of "I am not successful". When you do this you are listening to what else is available in creation that can "match" your preferred desire.

Or you can say to yourself, "the hell with it, I am successful" & create all kinds of visions of how the experience of "I am successful" can be reflected back to you through you family. So you can create all the different scenarios of how your mother say's to you that you are Un-believably successful because of "fill in the blank any way you want, but try to keep it close to realism".

You can spend some time every day actively attracting this vision of how your family is seeing you as being successful. But the most important part is not this. It is all the stuff that runs on auto-pilot in between.

So as you go about you day, catch you self every time you are imagining or remembering that your mother doesn't see you as successful. Now this part is very important.

When you catch your self, the first thing you do is say, "By believing this or remembering this, I am choosing to attract and experience this vision, that is now in my mind". I know it seems counterproductive. But it isn't. This is the acknowledgement stage.

Until you acknowledge that you are the attractor of everything you can't change anything. By saying "I am choosing to attract this towards me right now" you acknowledge that you are the architect of your suffering & joy. In this moment what was unconscious has now become conscious.

Now you can make an awakened decision. You can reverse your choice by saying "But now that I know that this is what I am attracting, I am choosing to release this experience from my existence. You can phrase this statement any way you want as long as the idea is of letting go of that idea.

By the way, don't think that you only have to do this a few times. You will find you self doing this, acknowledgement exercise, again and again and again and again and again. You will find your self doing this hour after hour, day after day.

Every time you worry or imagine this "how my mother sees me" vision, you have to acknowledge it again and again and also let it go again and again. You will start to notice how everything is attracted by you.

Rain drops Shape Mountains over eons of time. the same way you whole life is shaped and held in the "Now Moment" by this drip, drip, drip effect of constantly repeating insignificant looking thoughts. But repeated endlessly over time, their effect adds up.

If you try this technique with the expected outcome already in you mind as if it has already happened, you should be able to change you family's attitude towards you within a couple of weeks or at least in a month.

If nothing changes in a month, re-examine the exact nature of your vision. The key is within you, not them. They are simply responding to your anticipation of their judgment. You are unconsciously directing or instructing them on how to treat you.