I prefer being solo, and yes, you can be happy and complete as "one" person. People who think they need to be with other people all of the time in order to be happy, are too needy. My younger brother's ex girl friend was like that. Unfortunately, the shack-up led to a shacklet, and neither parent was suited to being a parent, so my nephew was raised by his maternal grand parents. People who aren't suited to parenthood should keep their legs crossed, or at least use birth control. And I am not referring to the murder of the pre-born.
Back on topic--before looking for a partner, you really need to first find yourself. That is, develop who and what you are. Trying to do that while also developing a relationship tends to put a strain on the relationship. It is very hard to be with someone who is still in the process of growing into who they are to become, because the relationship starts with the people being one thing, and then at least one of the people changes. They may not like what each has changed to.
Never forget that being solo is a viable option. You can do what you want when you want, within the limits of work, appointments, etc. You also don't have to put up with difficult people much when you are solo.
I am basically a hermit, and live alone, my phone is hooked to an answer machine to screen calls, and I don't have to pick up if I don't want to, and I get to not invite people over, since I don't go much for company. I also get to not attend parties and family get-togethers, unless I choose to go. I have health problems, which cause me to have an irregular schedule, so I eat when I choose, not on someone else's schedule. I also get to pick what I want to eat--as long as it is in the house, and without constant criticism of every molecule I injest.
I lived with relatives most of my life, and have lived alone for several years now. I never want to live with anyone again! Alone is much better for me. When I lived with relatives, we all drove one another crazy, as they couldn't deal with my being different, and I couldn't handle their unrealistic demands that I behave normal. We get along better now that we don't live together.
So remember, being solo is not the end of the world. Just take time to grow into being yourself before you try couple-hood. That way, if it doesn't work, you can still fall back on being solo, and won't be freaking out about that.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau