Impulsiveness in My Daily life after 26 years

I am in love with a girl. But only I know about how much I love her. It was a year back in June when I met her at work . She was a new to this Job. It was not love at first sight,rather I was just drawn to her by this impulse to speak to her . So almost everytime I met her, I used to just talk about the most random stuff. I had no feelings for her. “She was already in a relationship.” is what I thought,”why would I fall for a girl like her?”and more importantly “will she fall for me?”.
Three months later, we start going out and three months after , I again impulively confessed that I had feelings for her. BUT she was not ready for a relationship.”Hey,I am sorry, but lets be friends”. That was the most painful ‘yes’ I have ever said in my life.
So I shoved my feelings aside and tried to be friends. It was so fun , I learned so much about her . And everything i learned about her was fun , right from her taste in sweets,hate for chocolates and love for cheesecake to her deep dark past and trauma ,of which I know I have only scratched the surface. Every insecurity she has and things she loves and hates, getting to know all these things has only made me fall deeper in love with her. But she only thinks of me as a friend.
I have never made a connection like this in all my 26 years. And I want her for the rest of my life. But there are so many obstacles in our lives at the moment. So will I be able to marry this girl ? Or will I have to painfully watch her go into someone else’s arms? All I know is that I love this girl who loves me not.