It really is impossible to answer the question where do homeschoolers go to college any more than we could answer where do kids named Jacob or Kate go to college. Homeschooling is not uncommon. There are homeschoolers going every place from highly selective colleges to community college.
As far as how homeschoolers distinguish themselves there are lots of different ways. Work experiences, travel, volunteer experiences, internships, college classes in high school, competitions such as math and science competitions, sports that are not restricted by school attendance, arts, independent in depth study of topics of interest. One of the main advantages homeschoolers have over kids who go to school is that they have a lot more time available to devote to interests this is particularly true when compared to students who are attending elite, homework intensive high schools. Some opportunities such as internships may be easier to take advantage of for students who have daytime m-f availability.
As far as socialization, to me the concern there shouldn't be college but life. If your kid isn't well socialized enough to interact well with other people they've got bigger problems than college. Homeschoolers, like any other group of kids have mixed abilities. Some kids are mature and highly social, some not so much. Some parents are better at nurturing social development than others. Most homeschoolers are involved in a variety of experiences such as co-ops and community activities.
To the original poster, it isn't an all or nothing thing. You can always try homeschooling for a bit and see how you like it.
