Question: I am presently not working, and my job is just to look after my 15 months baby 24/7 which is making me frustrated, and I am staying with my in-laws with the constant whining of my mother-in-law. 

I feel I am not able to find personal time to relax or do what I like to do. Even though I get time to relax when my baby is asleep, I don't feel the time is enough for me to relax. I want to start a hobby or read books but I am unable to find time or, even though I find it, I am not in a state to open a book. I am open for suggestions on what I should do.

Answer: 
I found that switching to e-Books (e.g. through the Kindle, iBooks, or Kobo apps on your phone, or tabled, or through dedicated readers) helps a situation such as you describe a bit, in that **when** you have a moment of time, you can immediately pick up your book at the exact spot you stopped before.
You could spend a large part of each day with your infant strapped to your back while you pursue any one of hundreds of activities. 

I have seen young women with a baby in a front or back sling happily throwing pots, pruning plants, baking bread, hiking, shopping, and so forth. You could hand out flyers at the mall. Sacagawea Charbonneau explored a quarter of North America with her newborn son on her back; he was 19 mos old by the time she finished. 

Of course you can't do just any old thing. Discouraged activities would include bicycling, rafting, jogging, fencing. Attending a concert or the cinema would be problematical. Grouse shooting is right out. 

The best thing about an active hobby is that your baby will have a great appetite and no trouble sleeping. Also you will be much too tired to give a fig about whatever your mother-in-law has to say about anything.