Not at all, some are more deserving than others, but perhaps if you were a resident in Boston for instance (or any other area which an Englishman might feel a stranger in his own Country), it don't really matter how immigrants are classified. The numbers alone are of sufficient concern.
No need to worry though. You are OK.
I don't know why you repeat that mantra. As I stated, the problem is that places where there's ample space for more people to move into often have insufficient infrastructure properly to accommodate them whereas those where there's very little space do have it, which is rather like the kind of Catch 22 situation in which an assumption might be made that accommodation for immigrants cannot be found for either reason. The problem with this is that they have to go somewhere and, if they all stay put, there would be no population movement at all.
However, the same applies to population movement within a country as it does with such movement between countries; imagine, for example, if half the population of Scotland (including immigrants already there) decided to move to Wales, there would be both space issues in Cardiff and Swansea and infrastructural shortcomings in the more remote parts of the country, so the problem would be just the same as it would for immigrants.
The same problems would apply to those living outside EU with right of abode in UK should a substantial proportion of them decide to relocate to UK (which they'd be entitled to do and so couldn't be turned back by any UK authorities).
The notion of a stranger in one's own country is also a charged one. I assume you to have mentioned Boston (Lincs., not Mass.!) because it has a high proportion of immigrants (you could have cited Bradford or Wakefield to make your point), but not all English people living in any of those places would claim to feel as though strangers in their own country.
For the record, I've never had cause to feel like one in England either because I come from another country or because there are quit a few non-UK people living in my neighbourhood, wherever I've lived in England.
I suspect that a good proportion of those who have chosen to regard themselves as strangers in their own country wold probably feel like strangers in any country.
I would certainly feel like a stranger in any country with an extremely low immigrant population; I've noticed, for example, how strange it feels in certain parts of rural France where almost everyone seems to be French.
I don't know what proportion of your local population is immigrant, but mightn't you possibly feel - at least for a time - like a stranger in your own country were you to move to somewhere else in it, a long way from where you are now (Newcastle-upon-Tyne, say) that had appropximately the same proportion of immigrants (if indeed it did so)?
The other issue with all of this is, of course, this sense of "my own country"; this is something about which you seem to feel very strongly in an exclusivist way whereas I hardly feel it at all - and not just because I live in England - it would be the same if I lived in Scotland. Neither is "my" country; I don't own it!
Best,
Alistair