I can't join a realm, because i apear allready in it.

Since your friend is the owner of the realm have him kick you out then try to join again.

He did it many times, but I'm still there. I appear inside the game and I'm actually outside. Is there any way I can get out of Realm without being in the game?

Looks to be not effecting certain realms as i was able to join the one of the two i play on.

If you encounter connection or timeout errors in Realms, there are a number of things that you can do to attempt to resolve the issue:

• Check help.mojang.com to see if any services are down, service statuses can also be seen from any of our help pages
• Make sure you're not using a beta version of Minecraft. If you are, leave it and restart the game (Realms only works with release versions)
• If using a wireless connection, ensure that you have a stable connection to your router
• Configure your router to use moderate or open NAT
• If you have a firewall, antivirus, or are using a VPN, check the settings to be sure that it is not blocking or slowing your connection
• If you're on a stationary device, try connecting using an Ethernet cable instead of using Wi-Fi
• Try closing the Realm and re-opening it again
• Try reverting to a previous save of your world through your Realm's backup menu

Realms services are automatically set to a physical location nearest the Realm owner's IP. If for example, you live in the US, but the Realm you're connecting to is based in Australia, you may have a slightly lower connection speed than the owner of the
Realm.

Minecraft realms are currently down for everyone at the moment