I hate my self

I hate my self and my self esteem is lower than zero I am 24 full grown man but i look like i am 16 years old 170 cm weight 65kg no beard sound like a kid on the phone i am so tired of people treating me as a kid while i am a full grown man i go to the gym i try hard to look better but still people in the gym 18 years old looks way older than me i really hate my self i dont want to talk with any human being i just want to stay in my room and never go out again i never got in any relationship because i feel like i am this good