Portugal was only a big one fore some time, But the same thing with the other countries that you mentioned and and calling Portugal weak is just stupid, because:

Portugal was the first global empire.

Portugal Literally claimed half of the world and took more than it could.

The Portuguese empire won against 300 ships from the Otoman empire Mamluks and part of India with only 20 ships.

The Portuguese empire controlled the Entire indian ocean.

Napoleon failed 3 times to invade Portugal even without the Portuguese king being in Portugal.

Portugal fought a war against their colonies that were helped by CHINA USA USSR AND PORTUGAL ONLY STOPPED AFTER 14 YEARS!