Giuliana - the sensible part of me says "you should be careful!" You are very vulnerable in a foreign country, and sometimes these guys will try to sell your internal organs, or traffick you

If you visit a guy that you met off the internet, make sure that your friends and family know where you are, and make sure you meet him in a public place.
The other part of me says "Go for it!"

You deserve to be in love, and there are couples who can make this work. If it doesn't work out, at least you tried - and you will have the wonderful experience of having experienced his culture!
As for your family - they will have to live with your decision. I have been a dutiful daughter for many years, and I have never been thanked for it! I wish I had been braver at your age

Ask your family if they have any better ideas on who you should date, or if they want you to become some mad old spinster!

If your parents love you, they will ultimately accept that maybe you know best.
One final thought: if your parents are determined not to support you, you must ensure you are financially independent. Make sure you have enough money for rent and a plane fares! If you move in with him, check that your qualifications are valid in your boyfriend's country, so that you can get a job. If this is not practical, it might be wiser to insist that your boyfriend comes to stay with you.
Good Luck!