Your degree are somehow not related to your working tittle. As Sales Executive are normally has misc allowance for travel and commission/incentive based on performance, if not wrong. So that could be normally a reason that basic salary increment is quite slow. Which when you compare to a accountant for example, the position normally only got basic, and their salary increment is do more stuffs. (As far as I know)

As for nowadays, actually tittle doesn't mean anything. Some company hiring fresh graduate sales executive as sales manager and doing almost the same thing.

And construction project could earn a lot of commission...

Well for if you are incharge of your family business growth = your career growth, when you're the boss. I can't say much on this, my family doesn't own a business.

Well almost every job startup you will need to learn your company product/services, especially position related to sales. Cannot escape. May I ask that your company doesn't offer you commission/incentives?

So on the lack of topic when friends gathering, well it is happening to everyone though since is not majority of people working on same industry or position, you get what I mean? My friends tittle are like personal assistance, software consultant, business development, quantity surveyor and so on and on. But we get to talk some topic we interested to.
And less likely people wants to share like how to code this program, how he drinks talk with bosses for sales, how many steel required to build a house/building...

For property agent or insurance agent, yeah they can earn a lot and that's certainly. But you will likely need a broad of people network, is a job that earn mostly in commission, their basic is very low and they have no EPF(don't know true or not as my insurance agent said this to me, with her mercedes-benz car. LOL) It's more challenging than your position right now.

Well I advice you don't quit now, as it will affect your resume and you will just somehow learning something half way and abandoned it. If you quit now, your next boss will confirm question you.

My advice is you work for 2-3 years, then the next job interview will likely be easier. But is still up to your decision.