How I can see who watched my Strava profile?

Its kinda off topic because its a software question, but the software is used for cycling by a lot of people.

Visit

https://www.strava.com/athletes/YOURNUMBER/follows?type=followers

where YOURNUMBER is your strava user ID.

You can also find the same info by going to "My Profile" in the upper right menu, then click the third tab labelled "Following" which is under any photos you have recently shared. Then choose "Following Me" from the dropdown box.

Either way, you can see who is following you, and whether you follow them back or not.

Its a current snapshot too, someone who has unfollowed you will not be listed.

No, you can't. You can only see who is following you, not who is just looking at your profile/rides.