Sometimes i feel like my tongues to big and think if i swallow ill swallow my tongue, so i think loads, and it's fine please help?

See a physician: See a physician who can evaluate you and that issue. You can't get any accurate help over the internet for these types of issues.

Can't swallow tongue: unless your tongue isn't attached, you can't swallow it.Macroglossia can be remedied by surgery

See an orthodontist: Big tongue also called macroglossia. A less-invasive approach with orthodontic treatment is always recommended first. See your orthodontist for the evaluation.