what to do after 12th having a science background and I don't have any skills or talent
You don't need any new skill or talent in any particular field to do well in life after class 12. After class 12th you can do varies courses or prepare for government job or go for NDA examination to join army. If you want to do a course ,you can go for Btech or bsc as you wish for. For government job you can try CGL, or SSC or UPSC
would you please suggest some other alternative
Ayushi, can you help us whether you studied Mathematics or Biology for helping you with better information please?
B.Tech, B.Arch, B.Sc in Statistics, Acturial Sciences, B.Pharmacy, Pharma D. You can also study AstroPhysics because you have Physics as one of your subjects. Then you can study B.Sc Mathematics, B.Sc Chemistry. You also can study law because the law entrance examinations do not have any subject preference in their eligibility criteria. You can study Integrated courses too. CBSE has released a list of courses that can help a student in whichever stream he/she wants to go ahead. You can check that list at: http://cbse.nic.in/newsite/attach/Compendium%20of%20Courses%20after%20+2.pdf