Yes, u can definitely get braces at this age. Sometimes, front teeth looks big because they are forwardly placed (proclined), so after proper diagnosis we can decide whether you need extractions or not.
There are different type of braces like metal and aesthetic braces ( ceramic, these are tooth coloured). So, as u are 18 years old and must be college going .. u can go for aesthetic braces.
Next Steps
Visit an Orthodontist and get proper diagnosis done