Merry Christmas
I have
had never been alone during
the Christmas since I
could can remember.* I
was either spent time with my girlfriend or with my family.
Though it kinda gave me the opportunity to observe people walking around on the street holding someone’s hands**, looking/and they looked like they were really happy. I was sitting there and every once in a while I could would notice a couple nearby exchanging their gifts and cards. They were reading the cards with a smiles on their faces, surprised by the gifts prepared by their lovers. All of a sudden I felt really great, I was really happy for them. It might be one of the best Christmas'*** I have had in my life.
Merry Christmas:)
*"I had never been...since I could remember," or "I have never been alone...since I can." Had + could, Have + can. Have + can makes more sense in this context since you are talking about this Christmas. If you were telling a story from a past year you would say "I had never..."
**people is plural already, if you talk about an individual person they would be "holding someones hand"
***Christmas is plural, ends in "s" so it has apostrophe and no extra "s" : Christmas'
Nice work! Easy to understand what you mean.