It's horrible to feel this way. I know because this has basically been my life.
It's very lonely when you feel like your birth isn't significant to anyone. But it's not true, you do matter. I care. I want to celebrate your birthday with you. Everyone deserves to be celebrated and you're no exception to that.
I actually celebrated my birthday for what felt like the first time this year. I can't say I felt happy but at least I felt more appreciated and less alone in the company of people who I hadn't seen in a while.
I hate imagining others feeling the way I feel when it comes to events like this. It's such a sad thought. But you are cared about and things will change eventually. And if there is no one to celebrate with then celebrate yourself. Do something nice for yourself. Go somewhere nice. Treat yourself the way you would want others to treat you.
You feel alone but you're not destined to feel this way forever. Sometimes we have to do nice things for ourselves until we find people who we have a meaningful connection with. It's not easy, especially when you feel hopeless and depressed, but it gets easier.
So happy birthday to you :) I'm glad you came here so we can celebrate your existence together like this. Now eat some cake and try to find something enjoyable to do! It's your special day! It's all about you! :)
Lots of love - DA