Wa Alaykum Assalaam brother,
Firstly, welcome to the forum.
Regarding your questions, you should replace those interests with better ones, as suggested by brother ardianto. Music is something that a great many scholars have declared haram in Islam, so that is a big reason to turn away from these things. For detailed evidences on why it is haram, please see this post:
http://www.islamicboard.com/clarific...ml#post1550852
In addition, music and the other activities you mentioned are associated with many evils. A Muslim should avoid coming close to anything evil and instead try to keep his deen safe from these things as much as possible. We should even avoid those places which are dedicated to unlawful activities, as well as being in the social company of people while they are engaged in their wrongdoing.
Taking alcohol as an example, let us look at the following:
Allah says in the Holy Quran Chapter 5 Surah Maidah verses 90-91:
O you who have believed! ‘Khamr’ (all types of intoxicants), games of chance, idols, and divining arrows are all abominable works of the Shaytaan;
therefore, stay (far) away from these so that you may attain success. Indeed, the Shaytaan seeks to sow enmity and hatred among you by means of ‘khamr’ (intoxicants) and gambling, and to prevent you from the Remembrance of Allah and from Salaah. Will you not, then, abstain from these things?
Al-Tirmidhi Hadith 2776 Narrated by Anas ibn Malik
Allah's Messenger :saws: invoked the curse of Allah on ten people in connection with wine: the wine-presser, the one who has it pressed, the one who drinks it, the one who conveys it, the one to whom it is conveyed, the one who serves it, the one who sells it, the one who benefits from the price paid for it, the one who buys it, and the one for whom it is bought.
Al-Tirmidhi Hadith 4477 Narrated by Jabir ibn Abdullah
The Prophet :saws: said, "He who believes in Allah and the Last Day must not sit at a cloth (table or gathering) where wine is being circulated."
Sunan of Abu-Dawood Hadith 3765 Narrated by Abdullah ibn Umar
The Messenger of Allah :saws: forbade the sitting at a cloth (table or gathering) on which wine is drunk.
Allah :swt: has commanded the believers to stay far far away from any and all types of intoxicants, and the Messenger of Allah :saws: explicitly forbade the believers to sit or join in a gathering where alcohol is being served.
Please take care of these things brother, and focus on a good hobby :ia:. Allaah :swt: will be pleased that you left something for His sake and will help you in your career :ia:. :)