Hey Vishwajith Alva,

Mechanical and Civil Engineering are the two oldest and most applied fields of engineering. Civil Engineering is primarily about construction, design, and maintenance of the civil structures, infrastructures, and buildings. Mechanical engineering, on the other hand, in the simplest words is the engineering stream that deals in the mechanics of automobiles and other machines.Both these fields of engineering are evergreen and offer great job prospects to the students. These fields are applied in every sphere of life and in all places of the world. The job openings are available in the private as well as the public sector or government organizations.

Dear Viswajith
It's basically depends upon your passion. And also now I'm from Mechanical so I can say you can opt mechanical, so you do Have good future. But if you're passion is on construction how can you opt mechanical. Just question yourself and you'll get all answers.
All the best but choose wisely.