I'm 23 and have never had a relationship. Why?

So I'm 23 years old and I've never had a relationship with a guy. It's not that I need a relationship or anything, I'm confident of who I am and comfortable with myself, I'm just really lonely. I want someone to cook for, laugh with, and have tons of sex with lol.
My flaws are that I'd consider myself very traditional, I don't think it's right for me as a woman to make the first move. No one has ever taken interest in me, at least not that I could tell. I've also been told I can be a little intimidating by my friends and coworkers. I'm all about getting my work done and getting it done right. I've actively made attempts to ease up on how I act around people to maybe not seem so intense, but I'm not sure if it's working or not.
I've had guy friends and I've always gotten along well and worked well with guys, they just always seem to like me more as a friend and someone to ask advice about other girls.
I'm about to enter my last year of college and I'm starting to have really deep feelings that I'll never have a partner. I know I should stay optimistic and love myself, and I do, but that hasn't worked at all for me so far. I'm not ugly either, I'd say I'm a good 7 out of 10 maybe?
I guess I'd like to know what I can do to maybe seem more open to men? To signal that I'm available please flirt with me haha.
I'm 23 and have never had a relationship. Why?
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