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Software sometimes abbreviated as SW and S/W, software is a collection of instructions that enable the user to interact with a computer, its hardware, or perform tasks. Without software, computers would be useless. For example, without your Internet browser, you could not surf the Internet or read this page and without an operating system, the browser could not run on your computer.
IT is short form Information Technology and is pronounced as separate letters. IT is the broad subject concerned with all aspects of managing and processing information, especially within a large organization or company. IT is generally not used in reference to personal or home computing and networking.

Ethical hackers are specialized Cyber Security experts who work for all organizations which have an internet presence and use extensive use of web technologies for Business . Ethical Hackers role is a proactive one as they prevent cyber- crimes and protect cyber space from intrusion. They ensure data security and protect computer systems from illegal hacking activities. Computer Hackers use their expertise in computing and knowledge of programming, web applications, operating systems, assembly language, internet security systems etc. to protect computer systems from illegal hackers.
It is a niche skill and has limited career opportunities. However, if you able to break into your first job then its is very high paying and respected job. Most of computer hackers have graduation degrees such as B.Tech CSE/IT, BCA-MCA, B.Sc CS. Most of the hackers are those who have excellent programming skills.
You can appear in professional certification examination to become a Certified Ethical Hacker (CEH) by appearing in examination counducted by ED-Council. Certification is achieved by taking the CEH examination after having either attended training at an Accredited Training Center (ATC) or completed through self-study. CEH is a skilled professional who understands and knows how to look for weaknesses and vulnerabilities in target systems and uses the same knowledge and tools as a malicious hacker, but in a lawful and legitimate manner to assess the security posture of a target system(s). The CEH credential certifies individuals in the specific network security discipline of Ethical Hacking from a vendor-neutral perspective.

My friend, chill and don't worry. Your way of asking question clearly says that you are frustrated. Don't worry. Everything is going to be all right.
Here are a few best college for marine engineering:
1. Indian Maritime University (IMU) Chennai
2. Vels Academy of Maritime Studies Chennai
3. Tolani Maritime Institute(TMI) Mumbai
4. Maharashtra Academy of Naval Education & Training (MANET) Pune
5. International Maritime Institute (IMI) Noida
6. International Maritime Academy (IMA) Chennai
7. Institute of Technology & Marine Engineering (ITME) Kolkata
8. Coimbatore Marine College (CMC)
9. Academy of Maritime Education & Training (AMET University)
10. Samundra Institute of Maritime Studies Mumbai
All the best.
Don't worry.