Nikkah without guardian

Iam a 20 year old woman! I keep telling my mom, Get me married wherever I like, I don't want to commit sin (zina),But my mom says your dad will never agree until the boy earns something or can run a household. Despite that, I've told my mom repeatedly, but she says your dad will shout at me, and get angry, I know him. Don't even think about marriage for 2-3 years.and I'm in need So as he (the Man I love)! So, can I get married myself with 2 witnesses who are Muslim and mature? Will my nikah be valid? Because my mom is 100% sure that neither my dad nor society will agree."and there is the danger of nfs So Islam is that strict that someone is in need and their parents are not allowing her to marry! And I know all the Hadith about validness and invalidness But my topic is if guardian are not agreeing what should the girl do?