What would you do if your mom was married to this guy before you were born but?

your mom is an adult. focus on you

Also now focus on your school, job and chores. Make sure to give much love to both parents, help where you can.

School= College you want to go to, major you will go for, student aid of fee waivers or even scholarships ( go to the college your thinking about and just go to the student center and schedule a consular to discuss all this. They are very helpful. You might need to revisit to check that your on track. You can even take college course now if you wanted. Make sure your high schooling is on top of it's game.

Job=find any decent job near by that works with your schedule. Maybe waitress which gets good tips and you can talk so time will go by fast. Make sure to be smart, because there are many smart guys out there trying to trick girls with money.

Chores, just do them asap.

I hope this all will help.

On another note you seem to be a very nice person, so I like to add that what ever person you want a serious relationship with, take your time (years) and really really really see if this is the person you will spend your whole life with. If you can even better never get married and just enjoy your life with nothing serious, make sure the other party knows your intentions. I also like to add though, in marriage it is a different kinda love, a very valuable kinda love. Always do whats best for everyone like what you did when you asked this question,

Try your best. Love like you never love before. This is the best way for love to come and start surrounding your life. May love be around you, through you and is you.

Love and the Good Life will come

Also I see premarital counseling working.Church usually has it for free

Are you close with another relative, such as an aunt or grandmother? If so, maybe you can talk to them about it and they can talk to your mom. Don't get upset about it, he just sounds like a jerk. Maybe he's mad that your mom is asking for money.