I know this is an old post but I just happened to notice it while looking for something else!

´severim´ and ´olurum´ aren´t ´short forms´ for ´seviyorum´ and ´oluyorum´ - they are different tenses.  The ´im/um´ ending is the Aorist tense and the ´iyorum/uyorum´ ending is for the Present Progressive.

 Hehe when I posted this I didn´t even know about the iyor present progressive tense or any tense really  I was still learning my ben, sen, o and my benim senin onun etc haha, maybe I have learnt something in the last few months after all lol............ I´m amazed I got the translation near enough right though!

 ölürüm and olurum are completely dıfferent words.   Note of caution, online or print dictionaries usually do not translate conjugated words.   So when you see "ölürüm"  or olurum you have to look up "ölmek" and olmak respectively.

Literally "I always die" versus "I always am".  But "olur" can used the way we say "this is happening"  or like "its a happening thing" or even "OK"/  So then as like someone else said "Başına bela olurum" can be "I will always be trouble for you"