hi subhasri welcome to the forum
I don't know how to help you; I think you need to help yourself first before any of us can help you :-)
Firstly, you have done well so far. So don't worry.
Next, you need to have more self-confidence, if you want something, go all out and get it.
If you have a dream, make it come true.
Go and search for physics scholarships; there are a lot, I tell you, just start looking.
Start with websites like www.findaphd.com/ or google your topic, and see what comes up
You will surely find something. Good luck
love satchi