I am student at university. My question is like this: if I can spend a long time without doing sex while I was experienced before, what is the consequence?
You make it sound as if sex was a can of soda -- once you pop it open, you can't reseal it. It is a false view. Nearly every person spends a fair number of years doing without sex even after reaching the point of being able to have sex. Surveys also show that unmarried who do engage in sex don't have it as frequently as married couples, nor as regularly, since access to a willing partner is not stable. Even when a person doesn't think that fornication is wrong, it isn't unusual for that person to go through long periods without sex because they are without a partner. Therefore, what we conclude is that men and women, while generally preferring to have sex, can go without sex for periods of time.
That leads us to a second point. Your question hints that you doubt your ability to avoid having sex now that you know what it is like. I think you are selling yourself short. In the church at Corinth, there were many who experienced different types of sexual sins. "Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. And such were some of you. But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus and by the Spirit of our God" (I Corinthians 6:9-11). Because they committed themselves to a higher standard of living, they changed their behavior.
Christians don't give up on sex; instead, sex is reserved for one special partner -- a person that you have dedicated the rest of your life to be with. Because of that commitment, mutual respect, and love, sex within a marriage is free of reservations and worries. Thus, if you have a strong desire for sex, like most people do, then the solution is to find a partner to marry. "But I say to the unmarried and to the widows: It is good for them if they remain even as I am; but if they cannot exercise self-control, let them marry. For it is better to marry than to burn with passion" (I Corinthians 7:8-9).