why is my life so depressing? what can I do about it?? please someone help me?

Ok ..so im the only child for my parents. ..My dad is a captain in qantas AIrlines and my mum is a chartered accountant...both my parents have buzy lifestyle coz of their careers...for my parents the class and high standard life styles does matter..but for me its not like that...I really want to be happy but im not. .my dad comes home after long coz he is so much responsible of the airline he js working anf my mum has kind of pressure due her accounting profession and finally im the one who is left behind. .I do have many friends but I really want my parents to be with me..whenever I complain them about this they always say that they are doing all these Coz of only me ..im really happy about their careers but as a single child whom can I depend on for family love than my parents. .what should I do about this..btw im 20 years..I really feel so lonely sometimes ..what should I do about this ? Please help me