I think there is a difference between "being made to feel like a foreigner" and realising that you are one.
For us, the early weeks/months after the move were a whirlwind of emotions: tiredness from the physical move; elation that we had finally made it; realisation that this was for ever, not just a holiday. So, finding our way through the forms, offices, bureaucracy, supermarkets etc. to get everything sorted certainly brought home to us that we were no longer in our own country, but that was more a logistical thing than down to any attitude we experienced. We certainly didn't feel we were unwelcome at all (well, apart from the receptionists at the Centro de Saúde - an ongoing irritation, unfortunately, which I am still not sure is due to language/foreigner issues, or just the administration ethos in this particular health centre).
And now, two years later, my only problem is that I realise I just do not have an ear for foreign languages. I can read/write and even (not so fluently "off the cuff") speak Portuguese but I just can not get to grips with the spoken word. However, even with this limitation, I am successfully communicating with builders and architect without getting any feelings of resentment that I am a foreigner.
So, yes you might come across some barriers as you make your new life, but these will largely be down to navigating systems rather than from any personal antipathy to foreigners.