You're just too young to think about that. When you're mature enough it'll come to you. I'm not saying anything bad here, for every person it's different. Some people change their opinion and get married at 30-40 or 50yrs. The main thing here is to find your own path and somebody will come along to share it. On the other hand if you still haven't changed your opinion in a couple of years then it's OK. Ultimately everything is achievable and it's all your choice. Don't think negatively on something you haven't experienced yet.