Why does wearing condom suck so much? I use Trojan ENZ?

The problem is you've had without a condom. Everyone knows is supposed to feel better without a condom, but most try not to experience it due to the issue of pregnancies and STDs. You already answered your own question really when you mentioned it felt like a barrier between you and your girlfriend as that's the reason it's less pleasurable. If you'd been smart and hadn't went without a condom at least once you'd never know how good it felt without one. You can either try thinner condoms, stick to s as to avoid a pregnant girlfriend, or do without and risk having a baby or/and a STD. Sry man but you shouldn't have forgot that condom as now it'll always feel less pleasurable.