With respect to why we worship God, I think the words worship, or glorification, and the word love, are being used synonymously in this discussion, when they shouldn’t be.
All, or most of what has been said in previous posts on this thread deal with our loving God, and His love for us, and all of this is true- with respect to love. For God’s part, Love is the attribute by which He calls us to Himself, and our love for God is a reflection of His Love for us, manifested in our desire to be with Him, by keeping His commandments and maintaining our faith and hope in Him.
However, when we glorify God, we give to Him respect in the extreme, respect for who and what He is: A being capable of all creation, a being who simply is, and who has no end that can be reached. This respect, or “fear” of the Lord, as scripture tells us, is the first step in attaining wisdom. Wisdom leads to a better, deeper understanding of God, and thus enables us to love Him more deeply, but it is not the same as love.
It was, to be known, praised, and glorified, that God set all of creation in motion, for in creation, His infinite attributes could be seen. His love for us is only one of His many perfections made manifest in creation.
As to God being “stuck up,” or exhibiting a tendency towards egomania, keep in mind that Perfection is one of God’s attributes. Being perfect, He can have no flaws, ergo, His demand that we worship, or glorify Him cannot be a fault; God cannot be seen as an ego-maniac because He demands glorification from us. Likewise, as MarieVeronica stated, God needs nothing from us. A need is in essence, a fault, a defect, an imperfection. He, being perfect, can have no faults, therefore, He has no need of us.
This demand for glorification, therefore, belongs as part of one of His other infinite attributes; Justice-, or perhaps another, to which, I cannot put a name. He who brought all things into being, and sustains them, requires that His creation give Him glory, or worship, or if you like, the respect or fear due Him, for His Omnipotence, His Power, His Wisdom, His Love and Mercy, His Justice, His Magnificence, and on and on. God’s infinite attributes demand recognition, and in His Perfection, HE is the ONLY one entitled to demand such glory.
All creation glorifies God by it’s mere existence, for by the mere act of existence, God’s infinite attributes are on display for all to see. We, by reason of our position in God’s creation, give Him glory through the use of our faculties of intellect and free will; when we return His love for us in the things we do, whether it be in keeping tightly to His commandments or simply by doing the best we can in our station in life.
We also give Glory to God, when we bow our heads in silence and acknowledge that all honor and glory, praise and exaltation are His, now and forever.
So continue to love God with “ALL YOUR HEART, AND WITH ALL YOUR SOUL, AND WITH ALL YOUR MIND", but give Him the glory that is His due, for who and what He is…. GOD!