Hey good thing you shared your problem.
Getting again into BE college in tier -1 institute is difficult task if you are not preparing for long time. Also getting into BITS Pilani will not give you any assurance of getting 100 % job, You need to work your ass off to get good CGPA and get into good MNC.
I would suggest you to
- Dont think about past. Everyone faced similar issues. Because most of the students do not exactly know what they wanted to be in future at age of 17/18.
- Concentrate on your studies. Even if you get in to top institute, you need to study well.
- Do some courses outside, if you feel that your institute does not offer quality education / you have interest in other fields like CSE / IT.
I know couple of my friends who studies in tier -3 institute and are doing well in professional life. So dont worry & dont look back.