On about the same ship as you, although a year younger. Kissless, hugless, but really haven't tried at all. A bit different mindset for me, as I am not "disgusted" by hookups and dating seems like it could be a good time if approached the right way. And the reason is definitely not for "focusing on my studies and my running" as I've had plenty of fun and reckless times not tied to either. (unrelated, but the use of the term "my running" should be banned, I'll save the rest for another time).
This expectedly goes with other patterns in my life, where I have always been slow to make "real" friends or have connections with other people. I didn't feel like I had made new friends in undergrad until my junior year. It took me about a year to actually feel like I know the other folks in my research group. I've always been on the odd side, and increasingly so as I've grown up : growing-into it rather than growing-out of it.
For me I think there are several factors that go into it. Maybe most dominant is that I am really picky. I can think of maybe 4 people I've had an actual attraction to throughout my life, and 2 of those are in hindsight! I don't necessarily have super high standards, just different ones that are compatible with who I am.
The other main factor is that I have a terrible fear of "settling" with anything in life. I feel as though it would be easy to settle on the wrong person if things got going, or I wouldn't have the heart to end something just for the reason that I'm not satisfied. Of course this is ironic as my own inaction is also a form of settling, albeit with more options left open.
Family and friends have thought of I've just had confidence issues, but it's assuredly not that. I think highly of myself, but at the same time being critical of actions and inactions. This confidence is probably justified, as I've had friends, male and female, ask how I've never been in any sort of relationship in a serious but flattering ways. I've been hit-on, flirted-with by random people and acquaintances alike; girls have thrown themselves at me at parties (sometimes I didn't notice, sometimes I didn't care).
Of course this has begun to weigh on me more heavily with the corona lockdown, as I see friends of mine engaged in more serious relationships, and pondering the complete lack of any romantic experience on my part. Of course I'm still optimistic that if I keep doing interesting things (which I do) , and never settle, I'll eventually find someone, although things aren't getting any more promising.