Feeling insecure about my job?

I'm 29 years old female (no kids,no relationship) working in a plant/factory here in the states I didn't go to college or trade school I'm making 44k a year before taxes and im feeling like a loser for example this guy 3 years younger than me that was trying to get in my pants is studying to be a dental hygienist and is going to make bank I know he's doing it just for the money he suggested I study in a field to earn more money but all those fields are mostly medical related dealing with people which I don't want to do and I also don't have the luxury of not working like him while studying I have to work to survive I'm feeling insecure like everyone has their life figured out or is making more money than me any suggestions for me please?