Should I take pills if it's not a serious relationship?

Hi,

Finally tomorrow I'm going to get pills for the first time. It's been months that I get worried about being pregnant every single time I'm having sex.

I don't have a boyfriend, but I do have someone which is like friend-with-benefits kind of relationship for 5 months now, and we see each other once in a week or two.

The thing is, that suddenly I'm thinking maybe it's not the right thing for me to take birth control pills?

Does it worth starting taking it if I don't have a boyfriend and having sex with someone without commitment? Does it worth the side effects?

On the other hand I get really tired of being stressed all the time of being pregnant, even if there's condom.

Anyway what do you think? Should I start taking the pills or not?