First, you must realise interesting topics about which you like reading the most. Next, motivate yourself reading different books. You must choose a time that’s stress-free. I suggest, read during a quiet time. So, you can enjoy a book. This will make you look forward to reading more!
For being religious, age doesn't matter. It is up to everyone beliefs. It seems that some become more religious with time. Some tragedies in life at any stage seems to have made some people religious with a greater faith. If religious thinking gives them a sense of comfort, they will go with that.
It is not easy to deal with frustration. But if you feel that situation is frustrating just stay calm for some time and think how you should act to come out from this frustration. Think about the happy moments in your life. Just spend some time with family member or friends and try to be happy and calm with them and divert your thinking with some funny gossips.