I haven't watched Love, Simon before but I'll check it out!
One of my friends is gay and he went through a similar situation to you.
He has tried very hard to like females and be 'straight', including having sexual relations with them. However, he wasn't satisfied no matter what he did and remained attracted to males.
When he told us that he was gay, we were all really chill. If your friends don't accept who you are, they aren't worth being friends and I suggest finding some new ones. Family can be more tricky if they have a certain mindset. However, they just need to know that you're the same person but with a different sexual preference. Workplaces in Australia are becoming more LGBT friendly. They will receive backlash from the community if they discriminated against people who are gay.
My gay friend has dating apps too and I think you should continue meeting other gay people. You can gain confidence in your sexuality.
The same-sex marriage survey for Australia had an overwhelming amount of people supporting gay people. The majority of people support you, including me.
You're not going to be happy being in a relationship with a female no matter how hard you try because you're simply not attracted to that sex. It will be unfair to her as well.
I encourage you to love yourself more and accept yourself, including your sexuality.
You only live once, might as well make it as enjoyable as you can. All the best! You have our support <3