Our self-esteem is how we see ourselves and how much value we see ourselves having.
If you have low self-esteem you may feel like you dislike yourself, like you're worthless or no one likes you.
Days like Valentine's day can be difficult because there are a lot of portrayals of unrealistic and idealised relationships to measure yourself up to, and therefore a lot of ways you can feel you or your relationships are not good enough.
I criticise myself in a way I wouldn't dream of doing to others.
If you are feeling any of these things today, or any day, some things that can help are being kind to yourself, looking after yourself and setting yourself a challenge.