I am a 19-year-old girl and I am very inflexible. I feel like an 80-year-old grandmother because of this reason. I know some boys and they are more flexible than me. I feel very ashamed of myself. I want to increase my flexibility. But even beginner-level exercise are found hard for me. If I try to stretch harder, I result in getting back pains in the lumbar region. I also get back pain occasionally without doing anything special or when I try to do push ups. So I stopped doing pushups for this reason. It is so painful when I stretch my leg muscles especially when I split my legs and I cannot even split them too much. Can I have a chance to increase flexibility at this age? If yes, then how can I achieve it? Do I need to consult a doctor?