I am not a doctor but I did used to work as an optician. One of my jobs was to fit contact lens. Many people are like you, you closed and clinch your eyes when you see anything coming toward them. When I was working with someone that did this we were taught to stand behind them, tilt their head back, have them look down, I would put my left hand on their forehead, hold their top eyelid up very taught and slip in the contact, worked most every time.
I wear contacts and the best way to learn to insert them yourself is: lay a mirror on the table, bend over so you are looking in it, take your middle finger and hold your bottom eyelid open, have the contact on your index finger and slip it in, if you are still having trouble blinking use your other hand to hold the top eyelid open.
I started wearing soft contacts in 1980 and never had any problems - after they came out with the extended wear contacts I gave them a try, the ones I use are disposable and you are supposed to be able to leave them in but they make my eyes red too. I take them out at night and only wear them in the day. One thing that is different is the disposable contacts are thinner and tend to flatten out on you finger easier than the daily wear contacts I had. It takes practice but keep trying. It was worth it to me - I hated wearing my glasses as a teen-ager and young adult, contacts really helped my self esteem.
As to the vision changes, you can ask your doctor but to the best of my memory, contacts do make your vision better, you don't have the several inches between your eyes and the glasses. Also, young peoples vision changes rapidly, especially during puberty. After you get in your 20's your vision will stablize and you most likely will not change perscriptions again until you get in your 40's. Talk to your doctor and you may want to keep trying your contacts. Good luck
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