Lemon plant help

I am clearly a novice when it comes to planting but I grew a lemon plant from seed and just let it do it’s thing. I now have a trunk that looks like this. Not sure what I need to do about it. All suggestions are helpful. Thanks

Welcome, Jon.
what's it planted in, and what are your plans for it? If it were a tree in the ground or a real big pot that has a chance of fruiting out, I would prune off one or two of the bifurcated stems, depending on how big I want it to get, and what the stems look like farther up in terms of being healthy. You don't want to have a bushy mess where there isn't any airflow (bugs, diseases, etc). From the spikes I'm assuming the plant is pretty big?
I'm by no means a master of anything, but a few years ago I bought some citrus tree "whips" to put in large pots in my yard, and the guy who sold them to me told me to plant them and top them (cut off the top of the single stem, which really looked like the Charlie Brown Christmas tree, and I felt like a murderer doing it). But that forced out branches from the sides, and I did get fruit-- not bushels, but some, not bad for young trees. These trees are maybe 4 or 5 feet tall.

Thank you for the quick feedback. I have it in a 16x16 pot, growing indoors during the cold months, I transplanted it into a bigger pot last spring. When I did that I learned that all my plant was doing was shooting up and not branching out, it got to about 5 feet tall.  I pruned it down to about 2.5 feet and I think the plant looks better now. I have a good ph, 6.5. New picture attached.

What you could do is pull all three stems slowly in different directions by using a string or bonsai wire.
Just not try to spread them too much as they might crack at the joint.
Then thin to the inside growing twigs out for a good airflow.
We have done this for Limes and Mangoes with great success.