But what i don't understand is that those contrails are always in the line of where the sun is.
based on
Since the last few months i see a lot of activity in the air
Since there are lots of photos like yours in your general area dating years and years back...
most likely what is happening is that you read something that made you start to notice contrails. And perhaps you read the chemtrail myth that contrails only form over the sun as well. This would cause you to only notice them at that time (or you only notice them when you are driving home from work, for example, and you are facing the setting sun.
To tell truth, I used to notice contrails all the time, but haven't in quite a while since I haven't been thinking or reading about them here.
Posting more pics of contrails over the sun wont help. What will help (you) is to take panoramas of the sky everyday, multiple times a day. Or short video scans of the sky if your camera/phone/ allow. Then you will get a more realistic view of what the contrails are doing near you.