How can I become a trainer or lead, and what major or program should I study?

I work at a clothing warehouse.
im shy but i like to help new hires & guide them , walk around im not type to sit all day hiding in an office mute

i got asked last year to be a trainer but I deny as I had 0 confidence at that time & not ready. i lost my chance as now I ask to be a trainer & done tests & don’t get chosen & superiors don’t care im now confident.
At night shift there’s more drama young kids with higher roles & jealousy. Even tho I get told im a good fast worker they are not wanting me get higher role.

im depresed be picker sorter , packer. As im ready at 28 get promoted. & need more money.
the morning shift is more mature older workers but i got denied transfer as a lot of people want work in day& I don’t have class schedule to make them accept my change request.
one option is change to morning & maybe they will value & make me a trainer.

But there’s no classes at night part time. Just 8am to 6pm & job starts at 6pm. School gives you classes last min after u pay & job might still deny my request for school.

job also had part time work where I choose any day I want work but I don't know if manager will accept that.
Last year I lost chance change to part time as my guy friend manager was there at that time & said he’ll accept it 3rdwk Dec after holidays end

he’s gone & I fear I lost my chance.
I wanted be a dentist assistant but I have more interest be trainer than dentist assistant.
I hear pay as dentist asssitabt cud be 18-$30 an hour which is same as trainer , pay might be $19-22 an hour.
I can’t do 4 year degree as I need urgently money by age 30. 2027 I need do 9 month classes so by 30 end 2027 I rent big condo or buy house & have my higher pay job & husband I hope.
what shud I do?

How can I become a trainer or lead, and what major or program should I study?
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