That is one reason i'm skeptical about my doubts. I know i don't have much information, thats why i was asking if other people had same kinda doubts.
Still i'm going to go look some TKD and aikido(i find the idea interesting) schools. The place i do karate is close to me and other little farther awey, so if i don't find something i realy like more i'm not gonna change. Hopefuly looking other schools makes the doubt go awey or confirms my doubts
Coconut
I would suggest that you really think about what your goals are, what do you want to get out of the training, what is important to you, what your core needs are. Then look at some schools with that clarity in mind. This way you might be able to make a choice on the art and feel comfortable that it is a good fit for you. From the sounds of it, you are unsure of your choice of schools because it sounds like you didn't do any research and just picked one that seemed familiar to the TKD you did when you were younger. Likewise when you find something that you don't agree with (like the stances, or the blocking and punching combinations) then you start second guessing things again and the self doubts start turning inward.
It's like during a belt test when you make a mistake and the self doubt creeps in and then you make two mistakes, then three, and pretty soon you question should I even be here etc. etc. when you are just caving into your fears and doubts. This is a powerful force and I've seen it totally take over a student on a test before, heck I've done it myself.
Don't give into the fear, or the self doubt. Instead analyze what you are looking for in a school, or a style, and what needs you must have to be met(i.e. travel time, finances etc. etc.). Then select a school from there. Realize you are new to your current school, new to the art, and you don't know virtually anything (which can be a good thing).
First it is important for you to decide what it is that you are looking for, otherwise you might fall victim to signing on for the best sales technique, the lowest price, the newest dojo, or my favorite training with the ALL American or Pan American Champion. None of which may address your core needs. Likewise an arts or a school's impressive linage, or the instructor's rank etc. etc. isn't the main thing either.
You mentioned that you were going to check out TKD, depending upon the school/style it could be very similar to what you are currently studying. The aikido could be a lot of fun if you enjoy rolling, throwing and falling. However if you have issues with taking falls that might not be a good fit. If you are looking for self defense than both of these schools could teach SD skills but they might be byproducts of the curriculum not the main focus. Likewise you might go to a MMA gym and be taught several arts get a good workout and again still not meet your SD goals because the gym is teaching sports.
However your current school might be teaching karate but from a more combative type or SD attitude, like teaching applications to the katas than involve all sorts of nasty stuff, however you will miss out on that opportunity because you didn't understand what that school is about before you discounted it. If you take a look at the more traditional styles or katas you are going to question stances because it is training, not that you are going to fight like that. Decide what it is that you want and then talk with the instructor and see if the school is a good fit, but know your goals first.