Are contact lens deposits visible to the naked eye?

My monthly lenses are 20 days old today. If I hold them against a bright light, I can see small white grainy substances all over them. But this is not affecting my vision- once inserted into the eyes, I can see everything clearly. Instead, what's happening is that the lenses become uncomfortable after half an hour of wear, my eyes turn a bit red and itch like hell. If i remove the lenses, the itching goes away within 5 minutes but the redness stays for a few hours. If i endure the itch and don't remove the lenses, the SAME happens, the itchiness and redness go away after a while. Is this a problem with my cleaning solution? Or are these white grains protein deposits that are causing an allergic reaction?

I still have another 10 days life left on these lenses, should i throw away the lenses and open a fresh pair? Any idea what's going on?

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How severe is a -.25 astigmatism? And what does x105 mean?

I went to a new eye doctor today, and instead of my usual OD -2.75 sph, OS -1.75 sph prescription, the new one reads OD -2.75 -.25x105, OS -1.75 sph.
I did some research online and apparently this means I have an astigmatism in my right eye. I'm a little confused because the doctor did not discuss this with me, and at 29 years old, I've never been diagnosed with an astigmatism before. I've also never had blurry vision that I've noticed.
Is it possible to develop one this late in life? If so, how severe is this -.25? And what does x105 mean?
I have a couple of boxes of contacts that are not toric lenses… Will it hurt me to continue wearing them?

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Is this normal for a new glasses wearer? Very concerned!

After neglecting my eyes for a while I recently visited an eye doctor who said that my distance vision is less than perfect and that I need to wear glasses to see better. I got my glasses yesterday and my vision is much improved when I wear them but I have 3 major problems with the glasses.

1). After taking them off my vision is much worse than it was even a few days ago. Is this a bad sign?

2). I have noticed that the glasses make me a little light headed. Is this normal?

3). Also, the glasses make my eyes and face appear shrunken. Why is this happening? Will it look less weird if I pay for more expensive glasses?

I asked these questions to my friend who has glasses and she said that it depends on the strength of the lens. I didn't know mine but she told me to look at the piece of paper which the doctor gave me so I'm copying the letters numbers onto this.

OD SPH -2.50 CYL -0.25 AXIS 180
OS SPH -2.25 CYL SPH AXIS ---

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Are there defective contacts?

My mom said she doesn't think defective contacts are a thing, but I disagree. I use soft lens contacts and I have to throw away many pairs because no longer how many times I flip them inside out and use drops to freshen them, they always feel uncomfortable. So, are defective contacts a thing? Or am I just crazy?

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How to convince my parents to let me have contact lenses?

I'm 15 now and I want to have contact lenses. I want them since I turned 12. I tried to convince my parents to let me have contact lenses for several times but until now, all of them failed. I searched information about contact lenses wearing in the years so I know some information about contact lenses. My room is tidy (tidier than my parents' room). I always hand in homework on time. I study for tests and exams without the need of my parents reminding me. Cost is not a problem as my parents spend quite a lot on me (some of the costs are unnecessary that I can let them cut that off). My father stopped wearing contact lenses 12 years ago and is wearing glasses now. My mother do not need any vision correction. They said that I'm too young for contact lenses that my eyes can't be adapted to them (which is not true, the eyes of children can also adapt to wearing contact lenses). They also said that contact lenses causes the cornea to have not enough oxygen (there are contact lenses with high oxygen permeability). When I tried to explain to them about the facts and my points (in a polite and mature way, allowing them to think about it), they said no and change the conversation to other topics immediately. When I tried to change back the topic, they change the topic to other topics immediately, or told me to stop mentioning contact lenses. This happens every time. How should I convince them to let me have contact lenses?
Added (1). I will wash the contact lenses properly every day, and keep the case clean. I will not wear the contact lenses longer than the supposed time of wearing.

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