Racism is where someone says they are all like this or that

No. Racism is prejudice or discrimination against entire ethnic or cultural groups. Racism is looking at the colour of someone's skin and drawing conclusions about them.

You've said that you 'question' immigration on the grounds that

when people lose their own culture, society suffers

and

trying to have a multiple number of cultures living under the one state law will always be problematic

You also say that these beliefs don't make you a racist. That's the part I don't understand. You can't look at people with brown skins and think "they're all right, they're not English like me but that's OK": according to you, that's not OK (trying to have a multiple number of cultures living under the one state law will always be problematic). But you can't look at them and think "they're all right, they're just as English as me", because (according to you) if they were just as English as you that would be a bad thing (when people lose their own culture, society suffers).

In short, if you believe what you've been saying, you cannot not be racist.