First things first. If you feel like crap and are depressed you need to eat better and get more exercise. Even just going for a walk or jog once a day.
The trick to most successful people is they don't wait until they feel like it, they just go and do it because they know its what they need to do.
By exercising you will stimulate some feel good hormones which will help you for the next step. Your perception.
Depression (aside from biochemical issues) is largely due to having a picture you thought reality would be and it not matching your actual reality.
My guess is you thought your life would be a lot easier than it is. And I'm also guessing that many of your decisions have been based on trying to please others, especially your family.
In India, family, technology and spirituality are generally the highest values.
What I want you to do is write a list of at least 100 benefits you have gained from the path you have taken. And then 100 things that are bad about achieving the picture in your mind of how you thought things could have been.
This might be hard to start with but will definitely help you if you give it a go. Most of the time we romanticise a non existent reality by perceiving it to be much better than it is and we ignore the negative sides to it.
You're not alone, we all feel like this at times.