If you don't know how to put a condom I'm sure the bloke you're sleeping with will know! Then watch and learn! You need to discuss this with your partner. You should really be having sex using a condom anyways, to protect against STI's, as they are the only method of contraception that does that. Yes, they are disgusting and slimy and smell of rubber and are basically just gross, but they have to be used. Get used to it. What would you rather...an STI, a baby, or cracking sex (with a little bit of hassle at the beginning? I know what one I choose!!!)