I have frequently heard god described in such a nebulous way that it leaves me confused. The description is as follows, god is timeless, non-physical, outside this universe, everywhere, invisible, limitless in power and knowledge. Sometimes all these descriptors are present, other times just some.
I'll tell you how I define God:
Perfectly Holy: He is perfectly pure
All-knowing: He knows everything that has, is, and will happen/ing/ed
Almighty: He has control over everything and everything is sustained and held together by Him
Omnipresent & Independent: He is everywhere at once, timeless, and does not consists of anything of the universe. Physical laws do not apply to Him unless otherwise stated (i.e. in Jesus Christ's temporary situation)
Just: His standard is perfectly righteous, honest, and equal.
Loving: His love for His creation boggles minds and "drove" Him to willingly die for our sins
Sentient, Eternal & self-existent: He always existed, always will, and is conscious of His existence and lone status of God.
Triune: He is one God, three co-equal, distinct but not separate "Persons."
Mind-boggling: No one can fully know Him outside of the ways He has revealed Himself to the world;
etc.
How do you experience or perceive such a being?
Through prayer and the Holy Spirit.
Also, to those who claim to have "felt" god or heard him "speak" to you, how do you know the feeling or emotion you experienced are not entirely natural and not in any way related to God?
Because the "feeling" never ended, changed my life for the better since I started to serve Jesus, follow Him, and study the Bible.
How do you know the voice you "hear" isn't simply your own conscience?
The "voice" I hear guides me to do things I would never do of my own power and will, such as reading the Bible constantly, thinking when I read, apply it to my life, and help others who are in need. If I had never felt the "feeling" of the Holy Spirit moving in me, I would just be in my room all day, watching TV, and doing homework. I wouldn't have the compassion for other people I do after finding Jesus.