Transactions Not Working

[Ich Bin Dev]

Below is a test I did for transactions.

create table test_table (id tinyint unsigned auto_increment primary key, sometext varchar (20)) engine = innodb;
start transaction;
insert into test_table (sometext) values ('first text');
rollback;
start transaction;
insert into test_table (sometext) values ('second text');
commit;
select * from test_table;

As the first transaction was rolled back, 'first text' should not be in the database. However, the first insert is somehow committed and 'first text' is in the table. Am I making a mistake I cannot see?