You're right! Not going to college doesn't make you stupid. It just means...well, you're not going to college! There are plenty of other options out there.
That said...If you find something you really love to do and it requires some college or a college degree, don't let mental illness hold you back. You may even change your mind later in life and get a degree as a personal achievement. Don't let what anyone else says make you feel like you HAVE to do anything. Just remember that the options are out there and don't let anything hold you down.
(If you ever do decide to go to college, I also recommend taking advantage of student services. Most colleges today have a policy of accommodating students with mental illnesses and learning disabilities. I also agree with the online classes comment above.)