We can imagine what you must be going through,nevertheless, its never too late to start fresh.
As you say that you have done 2 years of BE;i.e 4 semesters if I am not mistaken.
If you have not been able to clear all the subjects and have a backlog, its advisable that you start with them and aim to clear them all.
And then follow it up with your remaining semesters so that you complete what you have left incomplete.
And at the same time keep reading about various career options that you are interested in .
You can log on to http://www.youngbuzz.com/careers/career-options to build on your career information.
Hope this helps.