I Miss Mom

I know I already posted this do just bare with me ok? My mom walked out on us when I was 8 and abandoned us. She doesn't seem to regret her decision. It hurts not having a mother around. My mom lives in another country. She lives in England fulfulling her needs. I want to built a relationship with her but most people are warning me that I should just forget it and she'll just let me down again. She sends us postcards and gave us a number to call her. Everytime I call her, she don't answer. I mean she lives on the other side of the world which I get it but she never calls back. I wanna make a trip over there but I don't know how my dad and brothers would react. Do you think it's worth it?
My dad isn't so sure about this. Even my best friend doesn't think it's a good idea and she'll just let me down and can see me get hurt. I understand what they're saying but I want the mother and daughter bonding I've always wanted. What us your honest opinion about all this? Don't sugarcoat it.