Feeling lost in Britain, because people don’t seem to understand you? The English voice isn’t easy to impersonate, because your own native voice will get in the way. The trouble is, your natural accent, which is the tune, tone and rhythm of your learned voice, when you first started to speak, will tend to overlay all the English you try to speak. Consider listening to BBC radio and watching newscasts on British TV, to get the inflections that the speakers use.
Most people who visit Britain from other countries rely on the English that they were taught at school. However, it’s very likely that the person teaching them English wasn’t an English person at all. This means that you may never get the proper way to speak the language. You would be better to listen to recordings of English pronunciation made by true English voices.
However, another challenge you may have with the language is that, although Britain is very small, you can fit it into India 12 times over, the influence of her language is felt everywhere in the world, on the Internet, in aviation and big business. That is why English is spoken by one billion people around the world. But learning to speak it so that everyone in Britain can understand you, is another matter.