Every time you spend money write it down. Easier to keep track of your expenses if you see them on paper.
Once you know that amount and what you're using it on, you can make informed decisions as to where you can reduce your spending in order to save that money instead.
yes, a budget that you put down on paper/spreadsheet will probably show you some expenses you never really thought of, and its a good idea to add EVERYTHING, even small monthly expenses like $8/month for netflix should be on there, if you dont account for that stuff you're only hurting yourself
Things like netflix and such are the stuff that people should be getting rid of. Paying for TV isn't needed at all as you can stream or download pretty much everything you want from alternative sources. Getting rid of non essentials even if it's just a little a month all adds up and this a is a great way to save.