I Am Depressed

So yesterday I travelled back from Dublin to Eindhoven yesterday and after a while me and a really cute and beautiful girl caught sitting a few rows to the front on the other side of the pathway eye contact and we both started smiling slowly and immediately there was a certain connection or whatever you should call it. I kept looking in her direction and she regularely looked back seeking seeking eye contact and everytime we both started smiling. After the plane landed we would look at each other every now and then, but I was traveling with my class so I couldnt really walk up to her without having my classmates notice it and probably laugh at me, in addition she was with some familly which would make it even more awkward. Now I will probably never be able to find her because idk where she lives nor her name. I shouldve just gone for it but I didn't, and now I feel depressed for not doing anything.