Engagement breakup

Hello sir my name is Prateek. I am suffering from mental trauma. My family discussed my marrige conversation with a girl family in bihar After lpng talk family decide to meet in ranchi on 26 june sunday and said if things works than we will go futher for engagement. From past one months i talked with girl on phone and chat during conversation i said i like her and ready to marrige .laterally Me my parants and two sisters went there and said them for the meeting they girls side came with 12 to 13 peoples and insistanly create a such pressure and quickly did engagement. I was in shochk and not in condition to decide that time as i am shy in nature. At the same time my family was also in shock so they did not undrrstand that what happens. After comming i feel that this will not work and girl is not suits to me. So i said to his parents and girl i cant go for marrige due to major difference and i feel i cant be compitable with her. They some time try to convinence and threanted me. I am confused and much in stress that how can i secure me. I and my faimly is very simple. I take only ring and cloths and give same along with cloths. We never said to book any place for that but they planed and book 2 room in jotel and a simple party hall. Please suggest how can i secure me. What i have to do. We did not take any mony exect than 3 to 4 thousand rupees on the occasion of touching feet.