First of all you should contact your college and tell your problems if they could help you in some way.if the problem is not resolved then you had to start over again and this time I would suggest you to go for a degree course rather than BTech course because there is a huge difference between your class 12th passing year and BTech passing year therefore better go for a degree course and then and I follow your interest maybe teaching jobs are suitable also if interested in research can go for it.