When should i know when to let him go?

ive been seeing this guy for 2 years hes always been their for me when i had boy troubles hes very diffrent from every other guy ive met super nice attentive sweet romantic all the nice stuff im used to bad boys...but anyways i know hes good for me i know he wont cheat i know he loves me but i just cant find myself to have with him im not attracted to him at all..hes not even ugly is just he doesent give me that spark hes not spontaneous hes kind of boring but safe all he likes to do is sit next to me and talk for hours i wish he can jus get his lazy *** up and go fix something! or impress me! go fix a car or sumthing go do something besides sniff my but all day its gets annoying i kno im supposed to be with a good guy but i dont want him to be so clingy i feel like if one day he gets into a fight im going to have to fight for him! hes wimpy kind of im an aggressive girl so next to him i feel like im the one who has to be in control..i want to feel like a girl sometimes not a babysitter god...my parents tell me to stay with him cuz u should always be with a man that treats you like a queen and that loves u more than you love him that way you wont get hurt...ok i understand but its like im scared one day were gonna be driving and hes gonna get a flat tire and im going to be the one to change it for him while hes in the car sitting down....thats why im not attracted to him hes not manly...hes kind of a nerd but i find nerds y cuz they are smart i just wish he wasent so soft...can i change him? can u mold a man into what you want?