I'm sorry that you are lonely.
But a soulmate can be a friend.
I believe Adam and Eve is the perfect example of soulmates.
As is David and Jonathan.
As is many others in the Bible if we look for it.
Rather presumptuous of you to assume I'm lonely. Actually, as I'm typing this I'm sitting at my amazing gf's house on a visit. My answer has nothing to do with feeling lonely, it has to do with the truth.
But by changing the meaning of soul mate you aren't improving anything. Soul mate has a very specific meaning behind it. People in modern society want to alter definitions to suit their purposes and beliefs, making language more and more divisive and unreliable.
Soul mates origins are in ancient pagan Greece. Romantic in nature. The idea that two people are created for one another romantically. This goes against biblical teachings that we are made for God, not other people.
This is akin to Christians using the word "karma". Karma has a very specific meaning and that meaning excludes the God of the bible. But many Christians try to alter the meaning by saying it's the same thing as "you reap what you sow", when it's not the same.
Lastly many try to use Adam and Eve for their argument but it's a weak argument. They were the first created humans. To assume their situation is meant to be applied all these years later, to all Christians, is the definition of stretching to misapply scripture to your beliefs.