Bitcoin already known and used worldwide. Sure the number of people who use bitcoin is still not as big as we wanted to but it is not small neither. I wish that Gox thing never happened. Because of that scam people got scared a lot and they see bitcoin as scam sadly.
how to make all people love this currency, and change bad image (scam) about bitcoin?
Bitcoin is already being recognized as legal by a lot of governments and countries and I think this would contribute to the legitimacy of Bitcoin and cryptocurrency. With this, Bitcoin has been getting more and more popular everywhere - positively and not negatively like a scam as you've said.
It would be awesome for it to be an international currency because a lot of people will be able to use it easily and conveniently, and this would give some ease for those who are travelling.