My name is Ana. I'm 18 years old and I find it embarrassing having a poo when I'm out somewhere or I'm at someone's house. I'm OK if I need a wee but a number two is out of the question unless I'm in the privacy of my own bathroom at home. I remember once last year I went to the zoo with my friend Claire and I needed a poo on the train journey there. By the time we got off the train I was busting for a poo and we both went to the toilet to have a wee but I held my poo all day. We got to the zoo at about 10:30 and I had a slight stomach ache and a lot of gas. Claire said she was going to the toilet which surprised me because she only been half an hour ago. I waited outside for her and I used the time on my own to release a much needed fart. I felt a little bit better after that but I had to clench at the end in case I pood myself. After 15 minutes Claire came out of the toilets and i asked her if there was a queue. Her face went red as she said awkwardly "Er yes, and it was a big one!" I though that sounds like a double entendre to me! We walked around looking at the animals until lunchtime and we went to a café for something to eat and drink and I was really feeling the need to relieve my bowels but I kept holding it as I couldn't face doing it in a public toilet with people around me. I had a small snack with a drink while Claire had a quarter pound burger with fries and she super sized it which is usual for Claire as she likes to eat a lot. After lunch we went to the aquarium section and we spent the afternoon in there. After that it was time get the train home and when we got to the station Claire said she was desperate for a wee and I needed a wee as well as as an urgent need to have a poo but of course I online peed which was difficult to do without pooing at the same time. When I came out of the toilets there was no sign of Claire and I knew there wasn't a queue in the toilets so I knew she was having a poo. I was seriously desperate to go by now and knowing Claire was having a second poo made me feel even more desperate and I thought what the hell and I went back into the toilets to have a very much needed poo. Claire was washing her hands by now and she asked me why I was back and I was too embarrassed to admit I was dying for a poo and I told her it was womens stuff. I rushed into a cubicle not realising that made it obvious I was desperate and as soon as I got the door locked I pulled my jeans and knickers down together and plopped my bottom down with a thump and I hear a girl saying to her mum, "She's desperate." I was so embarrassed and I had to hold it until I they left. Only one problem with that plan. I was bursting for a poo and I couldn't hold it any longer and I felt my poo coming out against my will. It stank and I can't even begin to describe how good it felt. The relief of it was nearly as good as an orgasm and I couldn't help sighing with relief. I pushed the last few bits out and wiped 6 times before I felt clean and I quickly left without washing my hands as I just wanted to get out of there. Claire embarrassed me by remarking I was a long time and I got my own back by telling her I wasn't as long her. She said she really had to do a number two and holding it wasn't an option and I told her I knew how she felt.