I may not ever make a MTT FT

I may never make a mtt final table, i have been playing mtt's alot for the last 3-4 months, prob average 4-5 a week. I am yet to make a final table. I play anywhere from 5.50's to 20+2's. I have been knocked out in about 70 percent of them on races, have been knocked out 15 percent when I have had a big hand cracked, AA,KK etc...and then the other 15 percent have been when I donk out. It just seems like I can never get lucky, win the key hand to get my chipstack to the level where I can smoothly make the final table. I have 1 FT in PL Omaha and that is it....any advice would be great since alot of you are very good at mtt's...

btw i play mainly on stars...

Dougan