Its something i've always known, but would never be able to fully believe it with all my heart. I'm not saying I do now, but its as close as it's ever been! 

Don't look for the acceptance of God through people. I am a child of God, cleansed and washed by my Father who owns me and yet still paid the price to buy me. 

Its okay when no one acknowledges you as significant, because you only live to please your King. You always want to be accepted or seen as someone special in other people's eyes, all so that you can know that you must be doing something right. But even being someone special does not necessarily mean that you are doing something right. It might be the case, but sometimes you may in fact be doing just the opposite. 

The way you can know if you're doing something right is by seeking Him through His Word and through prayer. Not through human approval. People of all sorts get married, so it is no respecter of persons. Maybe the right person hasn't found you yet, or will never find you, but please know that your Father's plans are best! 

Another thing you always try to do is to live up to God's expectations with your own effort. You always feel like you need to have tangible results of the work you do for Him to be valuable in His family and in His eyes. There are so many things wrong with this thought. Firstly, God gives the growth, you can only faithfully serve in the strength that He supplies. Secondly, he made you with full knowledge of each strength and weakness. The image of Psalm 139 is of the God of heaven molding you in the womb, consciously crafting you to be exactly who you are today, with every flaw and gift. Rest in the fact that you can only do your best for Him, and it is okay even if you fail. In your weakness He is strong! 

O Lord, you have searched me and known me!
You know when I sit down and when I rise up; you discern my thoughts from afar.
You search out my path and my lying down and are acquainted with all my ways.
Even before a word is on my tongue, behold, O Lord, you know it altogether.
You hem me in, behind and before, and lay your hand upon me.
Such knowledge is too wonderful for me; it is high; I cannot attain it.
Where shall I go from your Spirit? Or where shall I flee from your presence?
If I ascend to heaven, you are there! If I make my bed in Sheol, you are there!
If I take the wings of the morning and dwell in the uttermost parts of the sea,
even there your hand shall lead me, and your right hand shall hold me.
If I say, “Surely the darkness shall cover me, and the light about me be night,”
even the darkness is not dark to you; the night is bright as the day, for darkness is as light with you.
For you formed my inward parts; you knitted me together in my mother's womb.
I praise you, for I am fearfully and wonderfully made. Wonderful are your works; my soul knows it very well.
My frame was not hidden from you, when I was being made in secret, intricately woven in the depths of the earth.
Your eyes saw my unformed substance; in your book were written, every one of them, the days that were formed for me, when as yet there was none of them.
How precious to me are your thoughts, O God! How vast is the sum of them!
If I would count them, they are more than the sand. I awake, and I am still with you.
...
Search me, O God, and know my heart! Try me and know my thoughts!
And see if there be any grievous way in me, and lead me in the way everlasting! 
-Psalm 139:1-18, 23-24