It may be that you have a compulsive nature and tend to be a perfectionist in everything you do. However, it could also be that you appreciate the beauty of language and things that are written well. If so, that is great. Keep enjoying it. Your skill in writing could benefit you in the future as far as written assignments, literature, letter writing, job applications etc are concerned.
As far as text messages are concerned, you have to try and be reasonable about this. It is ok to use abbreviations in them because they are supposed to be fast and there is limited space for writing. Try to consider texting as abbreviated writing rather than a series of grammatical and spelling errors.
You have the advantage. You have mastered the language and that will take you a long way in life. It's a pity that so many consider texting to be the only form of writing, so they end up writing that way everywhere - even in job applications.