It's easy to look at and focus on the negative, especially as there is an industry of people pushing for reparations for anything and everything from serious to stubbed toes.
But you have to take it as a whole. I see slavery for instance as something that spawned the abolitionist movement almost as soon as Britain began to take part in it and resulted in it being deemed wrong and the end of slavery - something that hadn't happened before in history by any ruling empire.
It's also easy to forget what life was like for regular people and what else was going on at the time. Regular citizens weren't exactly 'free and comfy' either - you may have been sent off to fight in napoleonic wars or whatever.
Same for India - some see it as a blight on Britains past because we ruled a foreign country but that's what the world was then. Whatever wrongs were done, there were also many many 'rights' done too - cutting down on centuries of bloody conflicts and mass killings, ends to immolation of widows, education, medicine, transport, democracy - India was transformed into a better country and I challenge anyone to say it was worse when Britain gave it independence than before they ruled it.
But yes, I wasn't involved in any of that, the engineering advances or putting men on the moon either so can I be proud of it or should I be ashamed of the wrongs? I think we can do both but not beat ourselves up over how things were in another age - people pushed the needle of civilization forward and I'm proud that our ancestors ultimately made the world a better place even if others (and sometimes 'they') may have not been as enlightened as we would like by todays standards.
I think we have more to be proud of than some other cultures who for some reason are almost worshipped but who have a far bloodier and shameful past and only accomplishment seems to be banking on drums and wailing. 'We' have taken not just engineering but arts - music, painting, sculpture, writing, poetry etc... to extreme peaks. Cultures aren't equal - the music of Mozart is a pinnacle of accomplishment and the result of so many different disciplines coming together to enable it.
Why should we overlook all the good stuff just because other people didn't have the same spirit of learning and invention?