why I don't like the gym.

My dad keeps asking me to go to the gym, telling me that "I will feel better".
I mean I understand that exercise releases endorphins but I don't like the gym because

1. It smells.
2. I'm constantly comparing myself to the person next to me.
3. there are mirrors and if I look at myself while exercising I feel fat/ugly compared to other girls.
4. I don't understand the point of exercising just to be fit. You can be fit by doing something more interesting and useful, like dancing or playing basketball or rock climbing or being a production runner or doing the cleaning.
5. I don't want to exercise and think about losing weight. I don't want to think about my weight at all or have a "goal" because then I will get stressed about eating. If I get stressed enough I can make myself not eat.
6. I can't really have a goal to lose 100 pounds because I WEIGH 100 pounds.
7. The last time I lost weight because of a lack of appetite I was worried because I could feel my pants becoming loose, and it was only 2-3kg that I lost.
8. The ankle which I sprained in october feels like it's acting up, and I don't want to make it worse.