I think that building your confidence is a good thing if you feel that your self-esteem is lacking and you feel insecure. I did such a thing before I started dating because I didn't want to date someone like the person I had become. By that, I mean, I went through a depression and I lost motivation to take care of myself. I was overweight, I hadn't taken care of looks, I stopped dressing nicely and doing my hair, I had zero interest in anything and I was anxious and distrustful that dating would lead to anything. Did I want to date a carbon copy of that??? Yikes, no.
So I asked myself, do I really want a man in my life, yes, I did. I took about a year, lost the weight, started eating better, taking care of myself, grooming my looks to attract someone and dressed better. I took an interest in some hobbies that I still enjoy and started venturing towards a job I really liked. Yes, I suppose in a way that could be considered doing something shallow to attract a man in some people's eyes, but in my eyes, I was bettering myself first to put myself out there for a successful run at dating. And let's face it, the first thing that attracts a person is looks...that does sound shallow but it's realistic. So my goal of making myself the prettiest woman I could be was a productive goal because not only did I look great, I felt better, my confidence boomed and I suddenly was attracting all sorts of men from ages 21 to 65...I really had my choice. But I also wasn't looking for a specific type of man, I just wanted one who had good honest qualities and who had relationship potential, and of course one to whom I was physically attracted with lots of sexual chemistry, because that too is important to me. All the changes I made were positive for me, and I've become the person I molded myself into, because she was there all along hiding under misery, loneliness and insecurity.
I think it's okay to mold yourself into a better person as long as you have the right intentions.