Vent/need some words of encouragement

Idk how to feel..

me and my fiancé have been together for 7 years and during quarantine decided we wanted to get eloped when things opened back up and life is back to normal. When I told my dad (who is not with my mom and hasnt been since I was 2) he told me he was so happy for me and asked if I needed his help to pay for anything. I told his parents as well (my grandparents) and they had the same reaction! Even called my fiancé and said they can’t wait till he’s apart of the family and we’re gonna celebrate once our state is out of lock down. My grandma even offered me her ring because it was handed down by her grandmother and she wanted to do the same to me. I couldn’t believe it!!! So I told my mom and she said “if that’s what you really want” and I said well yeah it is and there are some amazing benefits like I could go to college for cheap because of it and pursue my masters. And we’re looking to get a mortgage here in November and we wanted to be married before getting a house. Then she said “well you shouldn’t get married just for those reasons alone” and I was just so upset like you know that’s the not only reasons... I told my grandma on my moms side and she was sad.. not happy but sad.. am I really sure this is what I want, how it’s so cheap he can’t buy me and ring and I’m using my grandmas “ugly” ring .. I just idk. This hurts a lot. What hurts the most is my mom and grandma are my best friends about anything else. They are the most loving caring people in the world. So it doesn’t make sense to me ugh sorry rant over.