Your dad sounds like an asshole. Kids can't magically pull treatments out of their ass without an outsider's help. If he has a problem with it, he should be footing the bill to take you to a dermatologist. They can find out exactly what type(s) of acne you have (if any -- some rashes act similar) and decide the best way to treat it depending on your situation.
I had serious acne when I was younger. It's important to get it treated as soon as possible; it can scar permanently. Here's some tips -----v (not a doctor, this isn't medical advice, consult your doctor before treating anything, don't sue me, etc.)
If your acne is just hormonal, there's pretty much nothing you can do without medication until you're past puberty. (Your name sounds feminine. Are you female? Hormonal acne gets worse around your period, especially right before it starts, and is centered around your chin more than your cheeks.)
If your acne is also hygiene related, there are some small things you can do to help:
1) If it's around your cheeks and/or on your back, start washing your sheets / blankets / pillow cases more often. (Shower at night instead of the morning so you're leaving less dirt in them. Do a splash of cold water at the end to close off the pores.)
2) If it's around the edge of your face or sides of your neck, start washing your hair more often. Leave a towel between your hair and skin while it's drying.
3) If it's everywhere and the above don't help, start moisturizing daily (possible multiple times per day). Make sure your moisturizer says it's "non-comedogenic" -- this means it doesn't have any skin-clogging oils in it. Don't use natural oils on your skin if you're prone to acne, either (like coconut oils, etc), as they can have the opposite effect on us.
4) If it's in tight areas (next to the nose, around the ears, under the lips, under the chin, between the thighs, in the armpits, etc.) or where you personally tend to sweat a lot, you may need to drink more water and/or keep a cleaner towel around when exercising to wipe off the excess. Acne from sweat also implies you're sweating oil more than water -- you may need to cut a bit of fat and salt out of your diet.
You may also be in a bad environment in general (smog, home smokers, fast food job, etc.). Try to keep the air in your own private areas clean when possible, then wear an oil-free foundation when spending time elsewhere. It'll help keep debris in the air from soaking into your skin.
Keep an eye on your diet as well. You may be mildly allergic to things like milk or peanuts without realizing it. If your acne gets worse within a few days of after having something like that in excess, it's probably a trigger food you need to cut back on. (There are ways to get this checked. A dermatologist may order allergy tests if they suspect it to be the cause.)
There's also illnesses that can cause acne by affecting the immune system or causing a buildup of sweat deeper inside the pores, etc. Sometime's it's just stubborn. Be aware that, even if you can't beat it and it does scar, there are products and treatments that can help heal them later in life. It's just better to treat what you can now instead of doing damage control later.
Good luck. Sorry you're stuck with a dick dad. And trust me, acne isn't a big deal beauty wise. People may make fun of it, but it'll never hide a pretty face.
(PS: Makeup talk? I recommend a kabuki-style brush to get even foundation coverage over/around acne. Try to find a mousse foundation if possible; powders and liquids tends to look odd on acne, and high-coverage ones feel too heavy.
This one's great and cheap. I haven't found a decently primer that works well without costing a fortune, sorry, but be aware that green/tinting primers rarely work on acne. They're more for rosacea.)