You can begin with reason.
I was an agnostic (a functional atheist) until my 30s.
At that point I began to begin to understand that godlessness destroys all of the underpinnings of existence and humanity.
For some people that is just okay, it is a type of neo-nihilism that can be fashioned to be anything they are comfortable with. (All too comfortable with.)
My science background is physics and chemistry.
Coming at the question of a Creator from that direction, it became clear to me that God (or something with all of the attributes of God) is a necessity for the existence of the temporal world (our universe).
Is that "scientific proof" - no, it is scientific reasoning.
The problem with asking for "scientific proof" is what one is willing to accept as scientific proof.
Some people want to see God with their own eyes ... very few have had or will have that opportunity on this side of eternity.
I see everything that exists as scientific proof for God, starting with the scientific axiom that 'From nothing, nothing comes'.
God reasonably and coherently explains the existence of everything, from the universe to our person-hood and even ability to reason, contemplate and make decisions.
We are persons, as such we are not simply our bodies. The person that you are cannot be simply the result of chemical reactions between your ears; you, the essence of you, is something else. Something that is not physical or the mere result of physics. On pure physicality there can be no such thing as /you/.
Some people try to do and end-around and find ways to assert that physical existence is not temporal. None of them are convincing to me as they have no basis in what we do know from physics. Yes, there are theoreticals and mathematically consistent models (they are only consistent within the limits of the model); but they still fall short as actual explanations.
There are a number of approaches to the question of God; cumulatively they point to the necessity of God.
You can begin with reason and come to the conclusion that God must exist, or just more than likely exists; but real confidence in God comes from communing with God.
God is Spirit and it is on the spiritual level that we commune with God.
You can start by simply praying: "God, I don't know if you exist; but if you do please help me to understand."
Here's the deal, no one is separated from God for not believing in God.
We are separated from God because we carry our sin.
God made a way in Christ that he would carry our sin; if we give it and ourselves to Him. We don't have to earn our salvation, we just need to become a person who is God's.
May you be blessed in your search.