Rock climbing is not difficult for beginners; if you can climb a ladder, you can definitely go rock climbing. There are different difficulty levels of climbing routes and bouldering problems, from easy to very hard. Start with something easy in your comfort zone, then work on improving.

The climbing wall has multiple routes, each set at a different rating, usually from 5.5 (French 3) (huge support, you can put your hands around, and many more) to 5.11 (7a), but if you live In a difficult area for climbers, their range can go all the way up to 5.13.
The eighth grade is a time when people are expected to grow and learn more.It is also a time when they should be working on their skills and abilities. Most people can climb 5.8 (5a) with some physical exertion. Beyond that level, techniques to conserve energy, learn effective body positioning and route finding skills become important. The holds are becoming fewer, smaller, or at more awkward angles. So they are as difficult as you challenge yourself to climb.

It's also worth noting that if you pull yourself up with your arms, you're doing it wrong. Women naturally climb better than men as beginners because they use their whole body, core, feet, and hands, rather than upper body strength. Men tend to be exhausted on their third ascent. If you want to become a better climber, develop the same techniques and physical abilities as a girl.