My mum treats me differently..............?

im muslim, 17. im the youngest of four, my eldest married a greek, my sister had a a boyfriends several times and i have always been the faliure at thinsgs. every one of them has done medecin at uni and i am the first to fail at my first year of A2 level and starting college. i feel like a failure. my sisters and brother have always succeded at everything and i ahvent. i havent ever been popular, or had a boyfriend in my life although i crave one because i feel ugly. i tried thinking i wanted to do medecin but its was all influence by my 2 sisters and my brother. i felt pressured by my parents although they neva said anything but i feel they show it in their actions. my mum sometimes says words like'bloody' and 'shut up' which is considered bad in my house cuz nobody ever says those words and i always tell her its partly because i am not like my siblings. thats why she treats me differently. i feel that i'm being walked all over because i haveent succeded in anything.