I'm in love and it's a beautiful feeling.

I'm in love and it's a beautiful feeling. (great!)

Today I want to tell you about a very beautiful woman that I love.  She has blonde,  medium length hair and she is wearing glasses also that I find very sexy.

It She is also very intelligent and has a very big heart.  She/It seems perfect.

                   "It" refers to inanimate objects, like a heart. "She" refers to a woman, "He" refers to 

                    a man. If describing a woman, say "she has nice eyes" or "she is very smart." 

                    If you are saying the woman seems perfect, say "She seems perfect." If you are

                    saying the heart of the woman seems perfect, say "It seems perfect."

The only problem is that she has a boyfriend and lives in other country.  I think it is useless to continue my heart to love her so much, but one cannot rule the heart.

                     You do not need to say "my heart" as it is redundant. Saying "I think it is useless to 

                     continue to love her so much, but one cannot rule the heart" conveys the message

                     as we all know love comes from the heart.

But maybe some day my luck will change. 

                    Formally, you are not supposed to start sentences with the words "but" or "and" 

                    however many Americans (including myself) break that rule and use it anyway in

                    informal text.

Please correct my text, if I am wrong.
Greetings from México.
Saludos desde México.

Looks great. See the green highlights for some alterations to grammar & punctuation.

Sorry for the bad formatting on my response. It's my first time using italki. Hope that helps!