How do I become "dateable"?

I (21M) have been struggling for a while in terms of my love life. I have never really had a real relationship aside from a few short-lived ones back in high school. I have been struggling because everyone always says that you need to be happy being single before you can be happy in a relationship, which I think is true. But, I am very happy with every other aspect of my life including friends, education, lifestyle, finances, and my own self-confidence, and I still have the lingering feeling of loneliness because I don't have someone in my life to personally share it with other than friends and family.

I feel that I am a fairly well-rounded person that genuinely cares about the wants and needs of others. My friends always ask me how my love life is and when I tell them there is nothing to talk about they always give me the speech, "Man you are the one person that I know deserves a good woman and that she will come around eventually. I am sorry that person hasn't come yet." This is really hard to hear for someone who feels like not many people are attracted to me. I have no issues in terms of self-confidence and having the ability to talk to people I am attracted to but I have not had any feelings of attraction reciprocated back to me.

I'm sorry for the long post, but I am someone who feels I eventually should find someone who I share common interests and values with, and that would be interested in a relationship, but after a while, it feels exhausting to be alone.

Does anyone have any advice for some in their early twenties that feels undateable? Thank you all