Hey, I know how it feels to not get what you want with a girl and end up leaving feeling crap. However, if you want to change that you're going to have to change the way you see yourself. You'll need to change your strategy also. How's your diet? Eating healthy nutritious food? Exercising? Have a good bunch of friends?
You need that stuff to get you being your better self right from the start.
Next, learn some material but don't come to rely on that stuff. You just need to know how to build rapport and attraction and it isn't that difficult when you know what to do.
The funny thing is that I found it easier to take a girl home then kiss her than to kiss her and then take her home. If you kiss her then say come back to my place she knows its to have sex and she might not be up for that. But, if you take her to your place coz you have some excuse or reason why she should come back to yours then kiss her, she doesn't have to think. Rather her emotions and the mood just take over.
hope this was of some assistance but I would be happy to give you more suggestions if you think it would be useful