@skhanjeelani1,
1. Masturbation does not damage anyone's sexual ability. If it did, the human race would have long since ceased to exist. You can keep masturbating, but it will probably not impact your sexual "ability" either way.
2. The way to please a woman sexually is to focus on her, rather than focusing on herself (I can't speak for women, but I will let any woman disagree with me on this). If you are worried about your "performance" you are doing it wrong.
3. The best way to improve your ability is to listen to what is important to her. It probably isn't what you think is important... the only way to get better at sex is to communicate as a couple.
4. The first couple of times having sex are fun, but they aren't the best sex you will have. They are times to experiment and try things out. Sex gets better as you practice as a couple and learn how to please each other. For each couple it it different.
5. Try using your tongue. The clitoris is very important to sex and the penis is (sadly) not the best tool for stimulating the clitoris. Of course, talk to her about what she likes... but try giving her oral sex, and when you try do it enthusiastically. There are two great things about giving a woman oral sex; first it is the best way to give many women an orgasm, second a man doesn't have to worry about his own "performance".
That's the best advice I have.