marriage

Ive been daiting my boyfriend on and off for 3 years and hes the only boyfrind ive ever had. I love him and want to marry him but lately ive been struggling with the idea that theres someone out there thats better for me. I only have this thought occasionally because i also want to figure out life with him and i love the idea of a life with him. Theres a couple qualities he doesnt have that i know i want in someone i want to marry but i feel like the possibility that there could be someone better isint worth how much i love him and want to be with him. I dont want to change him but what should i do? Its hard because if i ask my mom she thinks its a good idea for me to break up with him but the idea of that wrips me apart and its not what i want at all.

Hi everyone hope u had a great great day , so ... there is someone of my family(one of my parents cousin ) that loves me so much and always treat me like a princess and i like him too , but the problem is that he is older than me ( 12 years age gapppp🥲) but he looks too young and his personality is all i wish in a man , so...please gimme ur opinion if its normal to marry someone older than me or nope , be brutal and honesttttttttt