Comparisons between siblings are very common. This does not mean that you are unlovable. Have you ever conveyed to your parents that their certain attitude is hurting you? If you haven’t, please do it in first place. We do like and wish that people should appreciate and acknowledge our efforts and abilities. However, if they don’t; that does not mean we should start thinking that we are not capable. Keep on putting efforts and try to prove your abilities rather then becoming sentimental on such issues and waste your time & energy.