I have been working in my current company for 2 years and I joined them right after my college . I thoroughly enjoyed my work, especially colleagues and the responsibility ( right from day 1, I had huge responsibility which I liked) that I had during those 2 years. There is always that extra tension to meet deadlines. 

The company has a very weird structure. 80% of the development has less than 2 years experience and the rest have more than 6 years experience ( not in the company but overall professional experience ). The problem is I have been working on the salary that I signed up for initially. Less salary + feeling of being stagnant after 2 years + lack of guidance ( like someone with 4 years experience. The other people are unreachable, physically as well as intellectually) prompted me to look for other jobs and I got into this exciting opportunity and also pays me at least twice of what I earn right now. 

So, now I want to quit and move on, and when I said this to my colleagues ( and also close friends with same experience level ), they started feeling bad and at least 6 ( that is 40% of the development force. There are so many days when we spent days at the office cracking at issues together, just out of interest and no extra salary) told me they would quit the job if I quit. 

Now I feel bad. I genuinely like the company since they were my first job, had the chance to learn so many technologies, had nice colleagues and more than that I had huge responsibility right from day 1. Now I fear me quitting for another job would cause an exodus in the company. I don't know how to handle this situation. How to handle this situation?