the sending adress belongs to my wallet aswell but it got no privatkey, i know its confusing...
Its confusing because you use the wrong words, there are no sending addresses. If german[1] works better for you start a thread in the German section[2] and click "lock topic" on this one.
i can only export the privat key of my wallet adress
Yes, you can not export private keys of someone elses wallet.
as u can see on blockchain info i already sent an amount from this wallet via the sending adress which is the same my bitcoins went to but they dont show up in my wallet because they were sent directly to my sending adress
If you can send coins you must have the private keys for the address.
a´m i the only one who got two different adresses on my wallet?
I would assume most people have more addresses. IIRC multibit generates 5 for you by default.
there is one adress i can recieve coins and one i can send coins, when i send coins they are transfered from my wallet adress to my sending adress and from my sending adress to the adress i want to send coins
Thats not how bitcoin works. You dont have a balance, thats why there is no "sending address", its just that blockchain explorers show it that way. A transaction is using previously received transactions as inputs (left side on blockchain explorers, e.g. here[3]) and creates outputs that can in turn be used as inputs at a later date. If you received bitcoins at an address you can not send them "from" a different one as you can not retroactively change the transaction someone else created. You could create a transaction where you are sending coins to different address of yours. Is that what you did?
ID is d1992ee5e6c3d317334292387fb59c00b7a1fc91a751fc2d28fd7bca7e632cfe
greetz krampfl
In this case you formerly received 0.00199274 BTC on 12yxG5hP5FGew4m6kMVSoVGhAt6ZjuEBbD and 4 different inputs of 0.959, 0.41, 0.29 and 4.031 on 1JZ72DAJK1PDUg3hwE7LynKweF88eSmWMF. You used these 5 inputs to create 2 outputs. One to 1CSwCPbNj1iDjGkMP7LucpXPW3R4qdoYuC for 3.789 and one to 1JZ72DAJK1PDUg3hwE7LynKweF88eSmWMF for 1.90289274.
The way I know multibit is that the output to 1JZ is change. Because bitcoin has no balance but is only refering to old transactions you cant just spend part of your "balance" as your wallet shows it to you and keep the rest. The wallet composes a transaction for you using available inputs as needed. In this case you wanted to spend 3.789 BTC and the wallet used the best inputs according to its algorithms for this. Since it is very unlikely that you will have inputs that exactly match your requested output value + fees the wallet creates another output that is yours to spend. This concept is change as it is essentially the same when paying with cash.
[1] Assumption based on your name and the way you write.
[2]
https://bitcointalk.org/index.php?board=16.0[3]
https://www.blocktrail.com/BTC/tx/d1992ee5e6c3d317334292387fb59c00b7a1fc91a751fc2d28fd7bca7e632cfeEdit: spelling errors