I understand you concerns completely and I know some students leave because they feel that they are 'no good'. Since aikido is almost always with a partner, whatever level you are at you feel you could have done it better.
There is often a turning point, when you can do ukemi and protect yourself, when it just feels more comfortable. Sometimes people comment that aikido trains you to respond to an aikido technique in a certain way (through ukemi), and that is why beginners are so valuable to the class; because they aren't conditioned.
If you love it don't give it up!