No but you are suffering from poor attitude, self respect and confidence and that is going to effect your gameplay as well as your love life.
You will take a lot of crap from people but you need to learn at some point.
ANY class can be mastered by someone who intends to master it. This is world of warcraft, a medicore computer game desgined for pretty much anyone... its not the Oxford academy of cosmology and relative physics. You will be fine.
When you start raiding you will need addons, but when you do 5 man dungeons you will be fine (actually you should be fine, people who cant heal 5 man dungeons without healbots shouldnt be healing at all, and yes I am an arrogant prick).
On a side note, I can inform you that Druids and Shamans are generally Raid healers (with a few exceptions), as they are able to dish out a ton of healing to multiple targets with ease, while Paladins and Priests (Holy) are more specialized in single target healing, being able to keep a target alive and having strong single target spells.
Just pick a class, they are all good and certainly needed. You probably need to learn all 4 of them I am sure, so just flip a coin. None of them are easier than the other, altought I would consider Shaman to be the easiest but that is my personal opinion and shouldnt matter.
Just pick a damn class and learn it.