<human>: Provide a brief overview of the text.

It may seem petty, but it's my 20th birthday today. I understand that some friends may be busy or have probably forgotten and that's fine, but I'm talking about the ones who definitely know that it's my birthday, and that I always wish a happy birthday to every single year. 

For example, on Snapchat I've had various 'close' friends who watched my snapchat story where it's obvious that it's my birthday, and have been online on social media such as whatsapp yet have said nothing to me. 

I'm a very sensitive person so I'm finding it a bit upsetting that some of these people that I have done so much for, always been there for no matter what time it is and sent heartfelt birthday wishes to them annually would be aware that it's my 20th birthday today and say nothing :/ It only takes a few seconds and some of them have been online all day. Or is my disappointment juvenile? Interested in hearing your take on it.
<bot>: Close friends that I always wish a happy birthday know it's my bday and said nothing. Should I take offence?