Any advice on relationships please?

So heres the thing ladies ... I need some advice from a girl. Ive done mechanics at college do havent got any female friends so this is really the only place i can ask any females advice. Ive been out with lads over the years and every one of them has cheated, lied , or abused me... Hell one of them was seeing 2 girls behind my back and dumped me when she proposed to him. Is there something wrong with me or am i just choosing dickheads? And if im just choosing dickheads... How do i know if there going to be a fuckboy or not? Excuse my language .. I wasnt sure how to put it . Any advice will be much appreciated. Im just giving up when it comes to love 😫