After a month of hard work I have to pay quite a lot of things. I just got one about 200$ to invest in bitcoin. Should or should not. Please help me !

It's actually not a huge investment and with that amount you'll just have a lesser risk especially if you buy it with bitcoin. We all know bitcoin is the safest way to invest as you're still new in investing as we know how bitcoin behaves in the market even though it's volatile and somehow unpredictable. Be at least a long term holder and little by little try to add some to it.