I am a hindu boy, and I'm facing a lot of problems from my parents, I do believe in Islam but, I can't tell my parents about it, because they would be like the girl is the one who has brain washed you and stuff.
Please guys help me!

Have you talked to a spiritual advisor?

Talk to your parents and then try to convince them slowly.. Now in this generation the parent are more understanding.. Take 1st step.

Do you realize the girls family might have you or both of you killed? She is not allowed to marry a non-muslim - period.

Talk to your parents slowly. Do some more research on islam. And understand the islamic rules for marriage. Speak to the girls parents. Actually what are the parents of you girlfriend says about your relationship?

Hello. Kesi ha meri bhai ?
Hard to get an answer from one side
I'm muslim and I can understand how do you feel
Look make search about islam
Once you feel that this is what you want go for the second step, hint to your parents about islam
Give them the feeling that you got toward it
In case you felt like there is no chance they change to be muslims , you have to reach a point where you tell them I found myself asking god to lead me and all what I found is one god
I decided to be muslim and I will understand your point of view but no matter what you will always stay my parennts that I love and respect . Please understand me
Don't do it unless you have another home to stay in because lots of parents need time before they accept such a change , later on talk to the girls family
Tell them what happened to you and you decided to start a new start in your new family by marrying a muslim girl who will help you to stay in the right track
Hope everything goes as good as it can be and remember your change will need a fight so stick to Allah and always when it gets bad pray and ask him
With my full support
Hiba attia