To dream of a snail implies that you are easily riled up or upset. You shouldn't allow yourself to get annoyed so easily. You want to express your individuality, but something seems to be holding you back. It may also indicate that you are slowly reaching your objectives. Travel at a speed that feels comfortable for you.
To dream of a conch shell indicates that you may be experiencing reservations regarding your attitudes and opinions towards sex. Perhaps you are reluctant to express your desires or fantasies. You may feel embarrassment or shame at these sensual or erotic feelings.
To dream that you are crawling implies that you have put much deliberation and research in your pursuit of your objectives. It may also mean that you are not striving as hard as you should be. You can achieve more than you give yourself credit for. To dream that you are crawling out of a wreck or ruins symbolizes your determination and persistence.
To dream that someone is crawling towards you implies that you want to dominate a situation or manipulate it for your benefit.