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See, I'm just so naive that I get all excited and think "Wow! Her number must = interest".
There's your problem man. Stop thinking just because a girl gives you her number she is THAT interested in you. A girl will give you her number if she wants to see you again or if she wants you to get the fuck away or sometimes even because the girl just likes the validation from her friends. The last of the 3 seems to be what happened in this particular case of yours. Now, lets look into this... She's "being a bit risky by giving a guy her number infront of her friends." It gives her the feeling of "a guy likes me" infront of her friends. Girls act on emotion. That was how she felt AT THE TIME.
Don't take it so personally man. Go out and talk to more girls. This girl just didn't happen to like you. There are more of them out there. Go. Hunt. Find what you want and fucking get it. If you want to get what you want in this world, you have to actually get out there and get it. Nothing is owed to you for just being you. Hate to break it to you, but that is the way it is.
Now, this is an assumption based on the way you wrote your post... But I bet this girl didn't want to hang out with you again or "wasn't interested" is because you were a bit too... needy. You never ask girls for their number which means girls aren't begging you to hang out with them which means that you will naturally come off as a guy who is "sexually needy." No girl out there is going to want to fill your void. You are living in scarcity because you are afraid of rejection. Scarcity is not attractive. Abundance is. Develop an abundance of women and you won't naturally be so sexually needy because you already have girls.
Honestly, stop being such an emotional pussy and take the beating. Dealing with girls is like boxing sometimes... If you don't like getting hit, you better stay the fuck out of the ring. Not everyone is going to like you. Again, hate to break it to you... But that's human nature dude. Deal with it. Talk to more people. Start taking risks and risk getting your emotions bruised a bit. Figure out who likes you. And if you don't like the people that It's good for you. It adds character. Quite honestly, it'll maybe put some hair on your chest. Time to man up bro. If you want something, start getting it.