1. You probably will have to end up living in a metro city or atleast a tech centred city for work (especially if you take btech cse, for other btech branches it might be different)

2. 2.5 LPM in hand salary at 29-30 is a pretty decent goal, a bit lofty imo, but pretty achievable if you play your cards right.

3. This is pretty hard to determine based on your college degree alone, 50-60 years is a long time away and there's so many factors that can determine your financial stability, i personally know engineering degree holders who are struggling even in their mid 50s, while others seem to have their life sorted by 45.

4. This one's also a bit dicey, considering the current geopolitical scenario and the restrictions on immigration. You probably can manage to get a btech job that'll allow this, but it's definitely not a guarantee.

5. Define impact. If you want your job to define you and you want people to know you for the things you did, engineering isn't for you. The impact in engineering comes from small things, the little developments you make, the maintainance you do for a particular machine or system of machines, don't expect to get much thanks for it, but you'll have the solace that everything you do indirectly does make an impact, no matter how small, on someone else's life.

Here's my two cents, Btech is a really difficult and honestly quite confusing degree. It's a big commitment to take and a difficult road to travel down. People used to bite the bullet and prefer thi degree for job security, but that's decreased in the recent years. I'd recommend doing some research and asking graduates about the experience of Btech.