"Computer games"

Hi everybody. Could you correct my writing?
'' Playing computer games is a waste of time. ''

Most people believe that computer games are just a waste of time and they bring only cause problems/disadvantages. In fact, some games are full of blood, violence, and sex, which are not appropriate for children. In addition, playing compulsively you can become addicted to them thereby, isolating yourself from any form of social contact. (Verb tenses should be the same so either can become/will isolate or becoming/isolating)

However, a few games may can be a useful and interesting tool for children to learn something in a different way, that might otherwise be boring to them from textbooks. ( this sentence is awkward to correct because you are expressing too much in one sentence) For instance, history and geography games, where you have to fill in the missing word.-For example, fill in the missing word games for history or geography would be more interesting than reading from a textbook.

Personally, I think that playing computer games can sometimes be a funny fun pastime, without as long as you don't overdo it.  overdoing it. Sadly, nowadays this amusement has become a very worryng worrying trend.  (Awkward better to say "sadly what used to be just an amusement has no caused some to be concerned " To counter this hurtful potentially damaging habit, there are many other things one could do, such as doing outdoor sports, reading or conversing with others something else.

"Computer games"

Hi everybody. Could you correct my writing? 

Bold - what I added

strikethrough - remove

Highlight = my comments

'' Playing computer games is a waste of time. ''

Most Many (How do you know most? You would have to prove it, to say it) people believe that computer games are just a waste of time and they bring only have too many disadvantages. However, despite the negatives, (some games are full of blood, violence, sex, which are not appropriate for children. In addition, playing compulsively you can become addicted to them isolating yourself from any form of social contact and lead to isolation) numerous few games can be a useful and interesting tool for children to learn something in a in different ways. that might bore them in the textbooks. For instance, history and geography games, where you have to fill in the missing word.

Personally, I think (do you know or think) believe that playing computer games can sometimes be a funny pastime, without overdoing it.(Not clear what is being overdone) Sadly, nowadays this amusement has become a very worrying (spelling mistake) worrying trend. To counter this hurtful habit the dangers of computer games, there are many other things to do, activities such as doing outdoor sports,  or reading or something else (this last part was too vague) that are beneficial for humans.

Keep your sentences simple are remove any unnecessary words. You do not need to say are just a waste of time, you can say waste of time.