Are condoms enough?

So I think I’m going to be sex for the first time soon. But I’m worried about birth control. I always thought I’d be fine as long as I had condoms, but a friend of mine told me I shouldn’t rely on them. I looked it up and found that they’re only about 85% effective due to user error. But I want to know what goes down in the real world, would you guys use just a condom/do you think condoms are enough for preventing pregnancy and stds?