The keywords sentences as I see them :
• Early twenties
• I've never had a girl friend
• I hate my life and have no goals to reach for
Between 15 and 25, men are bags of hormones. They usually live surrounded by females at the peak of their SMV, in a setting where both their inner workings and society at large tell them having sex and funding a family is the pinacle of their existence. You're probably told implicitely or not that the key to happiness is to find a good woman and to make her happy so she'll fart out babies for you, and whether you actively believe that or are just swimming into it culturally, you have to know it's a lie.
You are very young. You probably have no cash, few achievments you can be really proud of, unless you're the next einstein, your skills probably havn't gone very far and you haven't tried things enough yet to know what you really want to do in the future.
And it's perfectly normal. You're not even old enough to know what a wortwhile lifegoal even look like.
Give it time.
And if you need a goal, like a temporary goal to keep yourself going ; here's the one I set for myself when I was struggling with depression : survive until tomorrow. And every day you reset that goal. You wake up every morning, and you say to yourself "Good. I'm still alive today. I'm doing great."
It worked for me and with retrospective, I didn't needed to bother myself with a life project as I had just started my adult life.
Spoiler alert on the next years of your life : it gets better as hormones fade and make you less dependant of outside validations, and you find what truely defines you along the way.
TL;DR :
• You're horny
• The void you fill inside is natural for your age and won't go away with a long term relationship
• You don't need to set a goal at your age
PS : I know you're not asking for advice so consider that as a counter rant.