Why are you an average rated player ?

Ans:  you are an average rated player because

• you do not study properly and regularly
• you are not clear about  basic concepts of chess
• you waste too much time on forum
• you are not serious
• you are misguided
• you are lack of intellectual ability
• your connection is bad
• you do not want to improve
• you are sick
• you do not feel comfort in online
• you do not have sufficient time

You left out:

 * Because you only play chess for fun, as it's a *game*

It takes alot of homework to be a strong player.

My main problems are

• bad calculation
• bad visualization
• i move too fast
• i miss my opponents opportunities

Its mainly a lack of concentration and will to work.

You only learnt checkers

It's just a hobby... for some

OP is also an average rated player, makes this thread and becomes a complete joke LOL

proper and regular training only will help one to improve his playng strength
and rating.

-you do not feel comfort in online

Surely. I'm 1500+ against engines with a PR of 1845, but against humans (online, at least) I'm getting worse and worse. I'm almost below 1400!

These are your answers.

Real reason is a lot of people simply don't have the talent or aptitude  to be a strong player. 

I've always been curious why there are so many people that think with enough study and practice a person will continue to improve forever until they become a GM.

Besides, you should do inquiry about other strong player nearby you and follow them how they improve.