Rob's answer covers most of the ground, but I'll chime in with some additional comments.
I hope that I create enough reputation and put my Stackexchange reputation in my CV. So, the reputation points matter to me.
To be honest, this is a bit of a weird goal. The specifics of your CV will depend on what type of job you're applying for, and indeed (as explained on Is Physics SE on your CV?) there are often several strong reasons why including your SE participation, and particularly your reputation, may not be a good idea or might even be directly harmful, regardless of how high your reputation is.
(In short, no matter how high the number, it's unlikely that the people reading the CV will know how to interpret it, and if the number is high then there is a distinct risk that it will be taken as a diversion away from your "real" work.)
On the other hand, if you are proud of your writing on this site, and you feel that it is a valuable contribution towards your hireability for the job you're applying for, then your CV is a good place to showcase your best posts and link to a place where more can be found.
Some shorter thoughts:
Sometimes, I spend a lot of time answering a question and then the question is removed!
This is a bit unclear. If you mean that questions get closed after you answer, then you should have a look at the closure policies and get a better feeling for what is off-topic here -- but it doesn't seem like you have many of those. If you mean that the question is deleted by the question owner, then this is rather bad luck and not very usual. If this keeps happening, save the links and ping somebody with 10k+ rep on chat -- we should be able to see the threads and help you recognize any patterns involved.
Other than that, as generic advise to stop that, I would recommend staying away from low-effort questions. The higher the effort that went into the post, the less likely that it will be removed.
Other times, I work out a detailed question and write down the answer for a bounty questions and I get the most votes but in the end my answer is not picked. There are times, and I write a long answer but no vote up and no vote down, does anyone read my answers at all?
As a general rule, it helps to think of the numeric rep as a secondary effect to writing nice posts. The post scoring is correlated with post quality, but it doesn't track it exactly, and it's not a great goal to track. If you can put yourself in the right mental spot for it, it's better if you just focus on writing posts that you yourself find satisfying to write (and you feel are satisfying to read). Keep an ear open for feedback, both in the form of explicit comments as well as under-scoring posts as an indication that the text did not strike a chord with its audience, but don't set too much stock on the numbers. If you write good text, the rep will come.
(And, also, as you spend more time writing, you get a better sense for what works and what doesn't, and that makes it easier to write posts that hit the mark more often. It comes with time, so don't worry about it! just write stuff you enjoy, and that intuition will build as you go.)
More generally: you're close to 1k rep and 60 answers in less than two weeks -- that is very impressive, and if you keep going like this you'll reach some very high reps very fast. (Also, if you keep going like this, you might burn out early, so take it easy whenever you need to!)
And, also: welcome to the site! I look forward to reading your contributions :-).