Idk where my life is going

I work much harder then my coworkers. Whenever my supervisor is away I am second in command but I get pay the same as them. I shouldn’t even bother trying if I get pay the same but if everything just stays without someone else leading then it will become a mess and it will be my fault. I recently been trying to get another job but I haven’t been able to get one. I feel my life is not going anywhere. I really want to become a teacher but I don’t know the steps for it or how I should approach it. I’m trying but sometimes I feel really depress on being unsuccessful at my age. I wish I knew I wish I had a guide to help me. I’m feeling so sad.