You received a scholarship for $4155. If you attended college and the college tuition/fees were at least $2855, none of it will be taxable and you will not be required to file a tax return. If you attended a qualified college, you should be receiving a Form 1098-T that shows the amount of qualified tuition that was paid to the school.
If less the $2855 was paid for qualified tuition, then it depends on what you mean by "Nobody who could claim me as a dependent is alive". If you had lived with certain relatives for at least half of the year (and they died afterwards) or if you lived with someone else for the entire year (and they have died since then), they MIGHT be able to claim you as a dependent, depending on more circumstances. If neither of those situations apply, nobody can claim you as a dependent and there is no tax and no tax return is required.
