Tampons bend a little bit and if your hands are positioned the "wrong way" sometimes it does feel like its going in sideways. Yes, probably every woman has done this. Also, if this happens, its possible your flow isn't heavy enough to be using a tampon. If you continue to use tampons and experience pain, however, please stop using them and contact a health professional.
No.
Yes, it is normal to see lots of menstrual flow coming out when you remove a tampon. A tampon is literally a plug of absorbent material, although it absorbs a lot of the flow some will collect behind the tampon and as such will leak out when you remove the tampon.
No this isn't normal and can be a symptom of a hormonal imbalance or pregnancy.
Sport tampons open in a cylinder shape and open all around when inside you where as a regular tampon is one that opens only width wise. Sport tampons tend to leak very very little where as normal ones leak quite frequently :)
If a tampon has blood on only one side, it is never a cause for concern. It has no medical meaning.
No, you urinate from the urethra and a tampon goes into the vagina.Both the vaginal opening and the urethral opening are right next to each other within the vestibule of the vulva, but they are not the same hole and it is not possible to insert a tampon into the urethra. A person can urinate as normal when they are wearing a tampon.
If your tampon tears - which rarely happens - then all you need to do is insert your fingers vaginally to remove the rest of the tampon. If it's just a small bit of tampon the vagina may clean it out itself, but otherwise you should go to your doctor to remove whatever is left if you can't remove it yourself.
ROFL What? Tampon insertion is not a condition to be diagnosed or managed. It is a normal choice that some women make for menstrual hygiene.
If it is right after you have one in, or if you are new to using them it is normal to feel that way
If you remove a tampon and it has brown spots then it is likely old blood, normal when your period is light as it takes time for the blood to leave your body and it goes brown. If your period is light then you should not be using tampons at all, only use tampons with full flow. If the tampon has brown spots before insertion then throw it out and check other tampons before using them.
Whether it's normal to feel pain after retrieving a 'stuck' tampon depends on what you mean by it being 'stuck', what you did to retrieve it, and how long afterwards it continues to hurt. If the tampon was 'stuck' because it was too dry then it would have caused vaginal tearing and irritation so would hurt. If the tampon was 'stuck' because you were tense and you had to force it out that would hurt too. If you're experiencing pain days or weeks after removal then you may be looking at an infection.
Tampon size isn't an issue, remember that your vagina is designed to accommodate things far bigger than a tampon, but tampon absorbency is an issue. Tampons dry-out vaginal tissues causing small tears in the vaginal walls, thus if you use too big an absorbency for your flow then it will have more of a drying effect so cause more tears - thus higher risk of TSS and more likely to cause discomfort. As long as you're relaxed and use the correct absorbency for your flow tampon use shouldn't hurt at all.