I was thinking in something like, if there are few machines mining in your country, most likely all transactions will pass trough you and youll recieve more. Is that wrong way of thinking how it works?
you don't get paid for "transactions will pass trough you" you get paid for including transactions into a block - either as a solo miner or part of a pool.
Bitcoin has no knowledge of countries or other artificial borders, transactions are put into a memory pool being worked on by all miners all over the world, whoever "solves" the block gets the rewards.