The advice I give both guys and women is become a gift worth giving.
Many guys are nice because that's their way of getting something, women can usually smell this a mile away.
Many women say they want a nice guy, but are attracted to guys who challenge them.
You asked 2 girls out and they both said not interested, I think you shouldn't look at their REASONS because that pre-supposes you need to change into something else. In my experience, women like a guy who isn't trying to change himself to be attractive. Just be who's God calling you to be. You hear it all the time, but sincerely just be you. Don't try to change yourself to be attractive, change yourself to more like Christ, to be a gift worth being given.
Besides at the end of the day, do you want a partner because of how you "appeared to be" or who you really are?
Also, if you like certain things in girls, do your best to be them as well, if you want a smart, funny, healthy girl... be the same, and don't let fear stop you, that's not Christ like at all, girls aren't rejecting you they are just giving you feedback.
You can tell the difference between rejection and feedback, one says: wow, I guess she's not the right girl for me after all and the other says: hmm, what's wrong with me
Scripture says you are a new creation, perfected by the Holy Spirit, focus on being who God is calling you to be and the right girl will be attracted to that, and until then watch for red flags that they might not be the right girl...
For instance, if a guy or girl changes the subject when you talk about God, red flag.
If you change the subject, you're giving red flags yourself to the guy or girl you think you want.
Don't ignore them red flags because they will keep getting more and more obvious until you're forced to make a choice if you'll change your morals for this person. Accidents happen when you ignore warning signs.
Ladies: remember you can't change people only God can, so no missionary dating. And guys, it's your responsibility to suck it up and at least talk to a girl you're interested in because you know those "bad boys" will be and looking for any type of weakness to exploit.
Just my .02