I'm 31 and I've never had a partner, but every time I've had sex, the experience of sleep (or lack thereof) that follows fills me with dread concerning what life will be like in a relationship.
Same age, everyone is different, but my experience is at least in your 20s when you're getting your first tastes of cohabitating relationships:
1) Starting cohabitating relationship: First a transition period where you lose sleep, but then you sleep like a baby, you don't stay up late thinking or worrying about x,y,z. The downside is you find yourself in a stagnating ball of comfort and end up challenging yourself a lot less because you're just too comfortable. (I look back at how lame I became in some of my cohabitating relationships, and could say the same for others I know, but would not to their face.)
b) Leaving cohabitating relationship: You sleep like a baby at first (nice surface feeling of independence), maybe for a couple months even, but then you grow anxious and feel negative effects of dependency withdrawal, and then end up losing a lot more sleep staying up late thinking or working. That can last a while, until you find another cohabitating relationship or find a deep rooted sense of independence again.
Again, likely different when you're older, but I think that's the general trajectory of being in cohabitating relationships in your younger years.
If you want a relationship (and it sounds like you do) then you'd better take a deep breath and jump into one, because live-in relationships are psychically demanding and complex, and it takes significant time to learn how to do it - not least because it's hard to fully know yourself until you develop the ability to see yourself through the eyes of others. And I don't mean in little glimpses, but in the sense of giving someone time to fully know about you, including the parts of yourself you'd rather keep hidden, the compromises you make (or demand) when your interests are misaligned but you're tethered to each other, and so forth.
I don't want to go into specifics as it's not a competition, but I've been sexually active nearly as long as you've been alive, and spent about 2/3 of that in relationships of various depth and complexity in addition to more casual flings. I'd say it's only around this stage of mid-life that I've developed a high degree of self-knowledge, even though I've been introverted as long as I can remember.
Relationships are hard work, and you won't just lose sleep, you'll get your heart broken over and over. But loneliness and isolation are terribly, terribly corrosive, and I would say that to hold back from fully engaging with life is to literally waste your time. The value of being in love, loving others, and allowing them to love you are beyond price and enable you to overcome any level of fear. If there is a 'point' to consciousness, it is to fully experience this.
You could die tomorrow, so I beg you from the bottom of my heart to start living today.
1) Starting cohabitating relationship: First a transition period where you lose sleep, but then you sleep like a baby, you don't stay up late thinking or worrying about x,y,z. The downside is you find yourself in a stagnating ball of comfort and end up challenging yourself a lot less because you're just too comfortable. (I look back at how lame I became in some of my cohabitating relationships, and could say the same for others I know, but would not to their face.)
b) Leaving cohabitating relationship: You sleep like a baby at first (nice surface feeling of independence), maybe for a couple months even, but then you grow anxious and feel negative effects of dependency withdrawal, and then end up losing a lot more sleep staying up late thinking or working. That can last a while, until you find another cohabitating relationship or find a deep rooted sense of independence again.
Again, likely different when you're older, but I think that's the general trajectory of being in cohabitating relationships in your younger years.