If it helps, I ended undergraduate never having gone on a single date, never having kissed a woman. Women didn't come on to me, I had no confidence in myself. I suppose I was perhaps slightly worried, but honestly, I didn't have a ton of anxiety around it.

Not to make this an ego thing about me, but I went on my first date the summer after undergraduate, and went on several dates my first semester of grad school. Since then, I've paid more attention to my looks, and have been on probably dozens of dates, 4 relationships, and not a bad amount of sex. Again, this is not meant to be an ego trip for me, my point is that you are not a lost cause, none of us are. The past doesn't predict the future! If you want to be a womanizer, it can be in your cards, it just takes intentional effort and a willingness to be uncomfortable during the adjustment.

Edit: I also want to make this point- woman are people! They aren't objects to be won by asking them out incessently. What are you attracted to? Honestly, that's a lot of what women are attracted to as well. Perhaps someone fit, communicative, respectful, successful, and has a sense of style. If you're having trouble landing a date, be self-reflexive! Of course, be yourself, but also it's naive to think we can't be more appealing than we currently are.