Getting engaged forcefully

Due to my disrupted family pattern, in order to get her image right in front of the society.. my mom is trying to get me engaged with my long term bf (6 years of togetherness). Neither is he ready nor am I..i m just 20 and this sucks.. 
what should i do. i feel really stuck.
Thank you so much.. I am really trying to be rational with her. Thanks alot 😘